Deferred Compensation Plan - Additional Information (Detail) (USD $)
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12 Months Ended | 6 Months Ended | 12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2014
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Jun. 29, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Investments And Employee Deferred Compensation Plan [Line Items] | |||||
Percentage of deferred salary and commissions | 25.00%hlm_DeferredCompensationPlanMaximumPercentageDeferredOfAnnualBaseSalary | ||||
Percentage of bonuses | 100.00%hlm_DeferredCompensationPlanMaximumPercentageDeferredOfAnnualBonus | ||||
Percentage of deferred matching contribution amount | 25.00%hlm_DeferredCompensationArrangementMatchingContributionPercentage | ||||
Vesting schedule | 5 years | ||||
Successor [Member] | |||||
Investments And Employee Deferred Compensation Plan [Line Items] | |||||
Assets held in mutual funds |
2,244,000us-gaap_RestrictedInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
$ 2,244,000us-gaap_RestrictedInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
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Restricted investments |
494,000us-gaap_RestrictedInvestmentsCurrent / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
494,000us-gaap_RestrictedInvestmentsCurrent / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
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Trading gains and offsetting compensation expense |
43,000us-gaap_UnrealizedGainLossOnSecurities / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
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Distributions from the deferred compensation plan aggregated |
0us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
0us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
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Predecessor [Member] | |||||
Investments And Employee Deferred Compensation Plan [Line Items] | |||||
Assets held in mutual funds |
4,386,000us-gaap_RestrictedInvestments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
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Restricted investments |
2,856,000us-gaap_RestrictedInvestmentsCurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
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Trading gains and offsetting compensation expense |
95,000us-gaap_UnrealizedGainLossOnSecurities / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
364,000us-gaap_UnrealizedGainLossOnSecurities / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
329,000us-gaap_UnrealizedGainLossOnSecurities / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
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Distributions from the deferred compensation plan aggregated |
2,893,000us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
864,000us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
357,000us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
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Maximum [Member] | |||||
Investments And Employee Deferred Compensation Plan [Line Items] | |||||
Matching contribution on deferred amount |
10,000us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_RangeAxis = us-gaap_MaximumMember |
X | ||||||||||
- Definition
Deferred Compensation Arrangement Matching Contribution Percentage No definition available.
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X | ||||||||||
- Definition
Deferred Compensation Plan Maximum Percentage Deferred Of Annual Base Salary No definition available.
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X | ||||||||||
- Definition
Deferred Compensation Plan Maximum Percentage Deferred Of Annual Bonus No definition available.
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X | ||||||||||
- Details
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X | ||||||||||
- Definition
The amount of distributions made to the individual during the period. No definition available.
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X | ||||||||||
- Definition
The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. No definition available.
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X | ||||||||||
- Definition
Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. No definition available.
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X | ||||||||||
- Definition
This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. No definition available.
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X | ||||||||||
- Definition
Amount of unrealized gain (loss) recognized in the income statement on unsold other securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Details
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X | ||||||||||
- Details
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X | ||||||||||
- Details
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