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Derivative Instruments - Schedule of Fair Values of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Cross-currency swap [Member] | Other long-term assets [Member]    
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ 2,504us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember		  
Cross-currency swap [Member] | Other long-term liabilities [Member]    
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable)   (1,036)us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
Warrants [Member] | Other long-term assets [Member]    
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ 321us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember		 $ 107us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_WarrantMember