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Derivative Instruments - Schedule of Fair Values of Derivative Instruments (Detail) (Other long-term Assets [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Cross-Currency Swap [Member]
   
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ 6,161us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
$ 2,504us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
Warrants [Member]
   
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ 311us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember
$ 321us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember