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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 09, 2015
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:      
Net cash provided by operating activities   $ 229,886 $ 486,254
Cash flows from investing activities:      
Capital expenditures   (586,661) (606,924)
Proceeds from sale of properties   0 324,888
Derivative settlements   213,336 (13,644)
Other investing activities   (1,175) (30,016)
Net cash used in investing activities   (374,500) (312,052)
Cash flows from financing activities:      
Proceeds from sale of common stock $ 463,100 463,010 0
Proceeds from revolving credit facility   320,000 100,000
Principal payments on revolving credit facility   (665,000) (335,570)
Other financing activities   (5,523) (3,576)
Net cash provided by (used in) financing activities   112,487 (239,146)
Decrease in cash and cash equivalents   (32,127) (64,944)
Beginning of period   45,811 91,901
End of period   13,684 26,957
Parent/Issuer [Member]      
Cash flows from operating activities:      
Net cash provided by operating activities   (2,611) (67,434)
Cash flows from financing activities:      
Proceeds from sale of common stock   463,010  
Other financing activities   (460,397) 34,760
Net cash provided by (used in) financing activities   2,613 34,760
Decrease in cash and cash equivalents   2 (32,674)
Beginning of period   776 34,277
End of period   778 1,603
Combined Guarantor Subsidiaries [Member]      
Cash flows from operating activities:      
Net cash provided by operating activities   232,497 553,688
Cash flows from investing activities:      
Capital expenditures   (586,661) (606,924)
Proceeds from sale of properties     324,888
Derivative settlements   213,336  
Other investing activities   (1,175) (30,016)
Net cash used in investing activities   (374,500) (312,052)
Cash flows from financing activities:      
Proceeds from revolving credit facility   320,000 100,000
Principal payments on revolving credit facility   (665,000) (335,570)
Other financing activities   454,874 (38,336)
Net cash provided by (used in) financing activities   109,874 (273,906)
Decrease in cash and cash equivalents   (32,129) (32,270)
Beginning of period   45,035 57,624
End of period   $ 12,906 $ 25,354