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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Mar. 09, 2015
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:      
Net cash provided by (used in) operating activities   $ 280,337 $ 673,492
Cash flows from investing activities:      
Capital expenditures   (740,633) (998,889)
Proceeds from sale of properties   78 324,938
Derivative settlements   291,436 (24,773)
Other investing activities   (1,161) (33,163)
Net cash used in investing activities   (450,358) (707,114)
Cash flows from financing activities:      
Proceeds from sale of common stock $ 463,100 462,833 0
Proceeds from revolving credit facility   618,000 370,000
Principal payments on revolving credit facility   (938,000) (355,570)
Other financing activities   (6,358) (5,515)
Net cash provided by financing activities   136,475 8,915
Decrease in cash and cash equivalents   (33,546) (24,707)
Beginning of period   45,811 91,901
End of period   12,265 67,194
Parent/Issuer [Member]      
Cash flows from operating activities:      
Net cash provided by (used in) operating activities   3,323 (64,099)
Cash flows from financing activities:      
Proceeds from sale of common stock   462,833  
Other financing activities   (466,175) 30,599
Net cash provided by financing activities   (3,342) 30,599
Decrease in cash and cash equivalents   (19) (33,500)
Beginning of period   776 34,277
End of period   757 777
Combined Guarantor Subsidiaries [Member]      
Cash flows from operating activities:      
Net cash provided by (used in) operating activities   277,014 737,591
Cash flows from investing activities:      
Capital expenditures   (740,633) (998,889)
Proceeds from sale of properties     324,938
Derivative settlements   291,436  
Other investing activities   (1,161) (33,163)
Net cash used in investing activities   (450,358) (707,114)
Cash flows from financing activities:      
Proceeds from revolving credit facility   618,000 370,000
Principal payments on revolving credit facility   (938,000) (355,570)
Other financing activities   459,817 (36,114)
Net cash provided by financing activities   139,817 (21,684)
Decrease in cash and cash equivalents   (33,527) 8,793
Beginning of period   45,035 57,624
End of period   $ 11,508 $ 66,417