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Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Asset Retirement Obligation [Abstract]    
Beginning of period $ 264,137  
Liabilities incurred 194  
Liabilities settled (3,201)  
Disposition of wells (2,164)  
Accretion expense 3,978  
Change in estimate 821  
End of period 263,765  
Less current portion (15,071) $ (15,071)
Long-term asset retirement obligations $ 248,694