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Derivative Instruments - Schedule of Fair Values of Derivative Instruments (Detail) - Other long-term Assets [Member] - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Cross-Currency Swap [Member]    
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ 4,633 $ 2,504
Warrants [Member]    
Derivatives Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ 311 $ 321