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Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Asset Retirement Obligation [Abstract]    
Beginning of period $ 257,943  
Acquisition of wells 0  
Liabilities incurred 1,645  
Liabilities settled (2,360)  
Disposition of wells (2,402)  
Accretion expense 3,744  
Change in estimate 69  
End of period 258,639  
Less current portion (7,271) $ (7,271)
Long-term asset retirement obligations $ 251,368