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Fair Value Measurements - Financial Assets and Liabilities Valued on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset - current | $ 10 | $ 69
Derivative asset - noncurrent |  | 6
Derivative liability - current | (1,479) | (1,903)
Derivative liability - noncurrent |  | (1,028)
Derivative assets and liabilities, Total | (1,469) | (2,856)
Significant Other Observable Inputs (Level 2) [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset - current | 10 | 69
Derivative asset - noncurrent |  | 6
Derivative liability - current | (1,479) | (1,903)
Derivative liability - noncurrent |  | (1,028)
Derivative assets and liabilities, Total | $ (1,469) | $ (2,856)

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