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Supplementary Quarterly Financial Data (Unaudited) - Summary of Results of Operations from Non-Routine Items (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Data [Abstract]                      
Gain (loss) on sale of oil and gas properties $ (212) $ (13,196) $ (1,647) $ 740 $ (307) $ 52 $ (111,830)   $ (14,315) $ (112,085)  
Net gain on extinguishment of debt (1,064) 100,540 56,196 33,380 23,155 51,054 7,267 $ (2,735) 189,052 78,741  
Impairments of unproved oil and gas properties   (76,391)   (7,753) (385) (5,090) (23,040) (40,432) (84,144) (68,947) $ (500)
Impairments of proved oil and gas properties $ (2,561) $ (113) $ (1,742) $ (22,718) $ (254,246) $ (544,714) $ (1,984) $ (403) $ (27,134) $ (801,347) $ (60,268)