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Derivative Instruments - Schedule of Gain (Loss) Recognized on Forward Interest Rate Swaps Not Designated in Hedge Relationship (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives And Hedging Activities [Line Items]      
Gain (loss) on forward interest-rate swaps $ (4,649)us-gaap_GainLossOnDerivativeInstrumentsNetPretax $ 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax $ 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Forward Interest Rate Swap Contracts [Member]      
Derivatives And Hedging Activities [Line Items]      
Gain (loss) on forward interest-rate swaps $ (4,649)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember