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Fair Value Measurements - Financial Assets and Liabilities Valued on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative asset - current $ 22 $ 388
Derivative asset - noncurrent 198 368
Derivative liability - current (1,956) (2,098)
Derivative liability - noncurrent (2,164) (1,673)
Derivative assets and liabilities, Total (3,900) (3,015)
Significant Other Observable Inputs Level 2 Member    
Derivatives, Fair Value [Line Items]    
Derivative asset - current 22 388
Derivative asset - noncurrent 198 368
Derivative liability - current (1,956) (2,098)
Derivative liability - noncurrent (2,164) (1,673)
Derivative assets and liabilities, Total $ (3,900) $ (3,015)