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Fair Value Measurements - Financial Assets and Liabilities Valued on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset - current | $ 463 | $ 388
Derivative Asset - noncurrent | 950 | 368
Derivative Liability - current | (2,258) | (2,098)
Derivative Liability - noncurrent | (3,172) | (1,673)
Derivative Assets and Liabilities, Total | (4,017) | (3,015)
Significant Other Observable Inputs Level 2 Member |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset - current | 463 | 388
Derivative Asset - noncurrent | 950 | 368
Derivative Liability - current | (2,258) | (2,098)
Derivative Liability - noncurrent | (3,172) | (1,673)
Derivative Assets and Liabilities, Total | $ (4,017) | $ (3,015)

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