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Derivative Instruments and Hedging Activities - Fair Value of Company's Derivative Financial Instruments Classification on Unaudited Condensed Consolidated Balance Sheet (Detail) (Other Liabilities [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Liabilities Derivatives Fair Value $ 2,312us-gaap_InterestRateDerivativeLiabilitiesAtFairValue $ 628us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Interest Rate Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities Derivatives Fair Value $ 2,312us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 628us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember