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Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Pension liability adjustment, net of tax benefit of $1,108 and $704 $ (1,862)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (1,275)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Deferred gain (loss) on cash flow derivatives, net of tax expense of $14 and benefit of $9 29us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 14us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Total $ (1,833)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,261)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (2,273)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax