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Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Asset Retirement Obligation [Abstract]    
Beginning of period $ 264,137  
Acquisition of wells 16,600  
Liabilities incurred 1,516  
Liabilities settled (8,153)  
Disposition of wells (4,731)  
Accretion expense 12,231  
Change in estimate 3,139  
End of period 284,739  
Less current portion (15,071) $ (15,071)
Long-term asset retirement obligations $ 269,668