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Concentration of Credit Risks - Additional Information (Detail)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Total Revenues [Member] |
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| Concentration Risk [Line Items] |
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| Major customer, accounted percentage |
40.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
|
39.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
|
40.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
|
| Successor [Member] |
|
|
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| Concentration Risk [Line Items] |
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|
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| Number of major customers |
3hlm_NumberOfCustomersAccountedForNetSales
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Sales percentage by customer percentage maximum |
5.00%hlm_SalesPercentageByCustomerPercentageMaximum
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Purchase major vendor percentage |
5.00%hlm_EntityWidePurchaseMajorVendorPercentage
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Trade payable major vendor percentage |
1.10%hlm_EntityWideTradePayableMajorVendorPercentage
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Successor [Member] | Accounts receivable [Member] |
|
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| Concentration Risk [Line Items] |
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| Major customer, accounted percentage |
42.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Successor [Member] | Total Revenues [Member] |
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| Concentration Risk [Line Items] |
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|
|
| Major customer, accounted percentage |
40.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Predecessor [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
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| Number of major customers |
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3hlm_NumberOfCustomersAccountedForNetSales
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
3hlm_NumberOfCustomersAccountedForNetSales
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
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| Sales percentage by customer percentage maximum |
|
5.00%hlm_SalesPercentageByCustomerPercentageMaximum
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
5.00%hlm_SalesPercentageByCustomerPercentageMaximum
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Purchase major vendor percentage |
|
5.00%hlm_EntityWidePurchaseMajorVendorPercentage
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
6.70%hlm_EntityWidePurchaseMajorVendorPercentage
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Trade payable major vendor percentage |
|
2.00%hlm_EntityWideTradePayableMajorVendorPercentage
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
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4.70%hlm_EntityWideTradePayableMajorVendorPercentage
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
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| Predecessor [Member] | Accounts receivable [Member] |
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| Concentration Risk [Line Items] |
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| Major customer, accounted percentage |
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44.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
49.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Predecessor [Member] | Total Revenues [Member] |
|
|
|
| Concentration Risk [Line Items] |
|
|
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| Major customer, accounted percentage |
|
39.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
40.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Customer Concentration Risk [Member] | Total Revenues [Member] | United States, Excluding All Points [Member] |
|
|
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| Concentration Risk [Line Items] |
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|
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| Number of separate customers |
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= hlm_UnitedStatesExcludingAllPointsSegmentMember
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= hlm_UnitedStatesExcludingAllPointsSegmentMember
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= hlm_UnitedStatesExcludingAllPointsSegmentMember
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| Customer Concentration Risk [Member] | Total Revenues [Member] | Canada [Member] |
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| Concentration Risk [Line Items] |
|
|
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| Number of separate customers |
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
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| Customer Concentration Risk [Member] | Total Revenues [Member] | Mexico [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
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| Number of separate customers |
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_MX
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_MX
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_MX
|
| Customer Concentration Risk [Member] | Total Revenues [Member] | Minimum [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
|
| Major customer, accounted percentage |
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
| Customer Concentration Risk [Member] | Successor [Member] | Total Revenues [Member] | United States, Excluding All Points [Member] |
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|
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| Concentration Risk [Line Items] |
|
|
|
| Number of separate customers |
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= hlm_UnitedStatesExcludingAllPointsSegmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
|
| Customer Concentration Risk [Member] | Successor [Member] | Total Revenues [Member] | Canada [Member] |
|
|
|
| Concentration Risk [Line Items] |
|
|
|
| Number of separate customers |
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Customer Concentration Risk [Member] | Successor [Member] | Total Revenues [Member] | Mexico [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
|
| Number of separate customers |
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_MX
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Customer Concentration Risk [Member] | Successor [Member] | Total Revenues [Member] | Minimum [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
|
| Major customer, accounted percentage |
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
|
|
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| Customer Concentration Risk [Member] | Predecessor [Member] | Total Revenues [Member] | United States, Excluding All Points [Member] |
|
|
|
| Concentration Risk [Line Items] |
|
|
|
| Number of separate customers |
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= hlm_UnitedStatesExcludingAllPointsSegmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= hlm_UnitedStatesExcludingAllPointsSegmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Customer Concentration Risk [Member] | Predecessor [Member] | Total Revenues [Member] | Canada [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
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| Number of separate customers |
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Customer Concentration Risk [Member] | Predecessor [Member] | Total Revenues [Member] | Mexico [Member] |
|
|
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| Concentration Risk [Line Items] |
|
|
|
| Number of separate customers |
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_MX
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
2hlm_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_MX
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
| Customer Concentration Risk [Member] | Predecessor [Member] | Total Revenues [Member] | Minimum [Member] |
|
|
|
| Concentration Risk [Line Items] |
|
|
|
| Major customer, accounted percentage |
|
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
|