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Changes in Accumulated Other Comprehensive Loss, Net of Taxes, Related to Interest Rate Swap Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before reclassifications, net of taxes $ 757us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax $ 497us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Net other comprehensive income 757us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 497us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Interest Rate Swap    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balances (2,870)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
(5,716)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
Other comprehensive loss before reclassifications, net of taxes (689)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
(979)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
Amounts reclassified from accumulated other comprehensive loss to interest expense, net of taxes 1,446us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
1,476us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
Net other comprehensive income 757us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
497us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
Ending balances $ (2,113)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
$ (5,219)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember