XML 67 R54.htm IDEA: XBRL DOCUMENT v3.7.0.1
Fair Value Measurements - Financial Assets and Liabilities Valued on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative asset - current $ 4 $ 69
Derivative asset - noncurrent 7 6
Derivative liability - current (1,485) (1,903)
Derivative liability - noncurrent (636) (1,028)
Derivative assets and liabilities, Total (2,110) (2,856)
Significant Other Observable Inputs (Level 2) [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset - current 4 69
Derivative asset - noncurrent 7 6
Derivative liability - current (1,485) (1,903)
Derivative liability - noncurrent (636) (1,028)
Derivative assets and liabilities, Total $ (2,110) $ (2,856)