Stock-Based Compensation - Additional Information (Detail) (USD $)
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6 Months Ended | 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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Jun. 30, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Common stock options available for grant | 44,021.264us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | |||||
2014 Equity Incentive Plan [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Common stock options available for grant |
8,204.254us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
8,204.254us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Common stock options granted |
35,817.010us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Common stock options granted |
18,208.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Dividend yield |
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Risk-free interest rate |
2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Expected volatility |
32.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Share based compensation |
$ 675,000us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Unrecognized compensation expense for unvested options |
6,110,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
6,110,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember |
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Weighted average period required for recognition of compensation expense | 4 years 6 months | |||||
2014 Equity Incentive Plan [Member] | Time Based Vesting [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Fair value of option |
$ 372.598us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember / us-gaap_VestingAxis = hlm_TimeBasedVestingMember |
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2014 Equity Incentive Plan [Member] | Performance Based Stock Option [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Common stock options granted |
17,608.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember / us-gaap_StatementEquityComponentsAxis = hlm_PerformanceBasedStockOptionMember |
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Share based compensation |
0us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = hlm_TwoThousandFourteenEquityIncentivePlanMember / us-gaap_StatementEquityComponentsAxis = hlm_PerformanceBasedStockOptionMember |
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2014 Equity Incentive Plan [Member] | Minimum [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Expected term | 6 years 6 months | |||||
2014 Equity Incentive Plan [Member] | Maximum [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Expected term | 6 years 9 months | |||||
Deferred Stock Unit [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Deferred stock units right to receive a cash payment |
1,323,000us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_AwardTypeAxis = hlm_DeferredStockUnitMember |
1,323,000us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_AwardTypeAxis = hlm_DeferredStockUnitMember |
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Predecessor [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Predecessor's number of shares |
44,180us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
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Share based compensation |
39,229,000us-gaap_ShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
9,006,000us-gaap_ShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
714,000us-gaap_ShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
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Deferred stock units right to receive a cash payment |
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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Employee Stock Option [Member] | Predecessor [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Predecessor's liability |
$ 48,517,000hlm_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockOptionLiabilityPriorToCancellation / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
X | ||||||||||
- Definition
Share Based Compensation Arrangement By Share Based Payment Award Stock Option Liability Prior To Cancellation No definition available.
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- Definition
The amount of distributions made to the individual during the period. No definition available.
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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
Unrecognized cost of unvested options awarded to employees as compensation. No definition available.
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X | ||||||||||
- Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Expected term of share-based compensation awards, 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
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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X | ||||||||||
- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average grant-date fair value of options vested. No definition available.
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