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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenues        
Total revenues $ 197,235 $ 368,659 $ 607,668 $ 1,090,556
Operating expenses        
General and administrative expenses (22,358) (23,915) (67,190) (68,186)
Other operating expenses   (210,684) (601,648) (579,718)
Total operating expenses (217,333) (234,599) (668,838) (647,904)
Gain on sale of properties 172 43 172 187,076
Operating income (loss) (19,926) 134,103 (60,998) 629,728
Other income (expense)        
Interest expense, net of capitalized interest (36,513) (39,420) (112,702) (118,568)
Other income (expense) 103,886 103,388 111,655 20,503
Income (loss) before income taxes 47,447 198,071 (62,045) 531,663
Income tax benefit (expense) (20,392) (76,484) 17,829 (201,290)
Net income (loss) 27,055 121,587 (44,216) 330,373
Parent/Issuer [Member]        
Operating expenses        
General and administrative expenses   (6,373) (20,847) (17,790)
Total operating expenses (5,903)      
Operating income (loss) (5,903) (6,373) (20,847) (17,790)
Other income (expense)        
Equity in earnings in subsidiaries 49,899 148,357 28,269 410,775
Interest expense, net of capitalized interest (34,020) (36,724) (103,435) (110,853)
Other income (expense) 1   5 3
Income (loss) before income taxes 9,977 105,260 (96,008) 282,135
Income tax benefit (expense) 17,078 16,327 51,792 48,238
Net income (loss) 27,055 121,587 (44,216) 330,373
Combined Guarantor Subsidiaries [Member]        
Revenues        
Total revenues 197,235 368,659 607,668 1,090,556
Operating expenses        
General and administrative expenses   (17,542) (46,343) (50,396)
Other operating expenses   (210,684) (601,648) (579,718)
Total operating expenses (211,430)      
Gain on sale of properties 172 43 172 187,076
Operating income (loss) (14,023) 140,476 (40,151) 647,518
Other income (expense)        
Interest expense, net of capitalized interest (2,493) (2,696) (9,267) (7,715)
Other income (expense) 103,885 103,388 111,650 20,500
Income (loss) before income taxes 87,369 241,168 62,232 660,303
Income tax benefit (expense) (37,470) (92,811) (33,963) (249,528)
Net income (loss) 49,899 148,357 28,269 410,775
Intercompany Eliminations [Member]        
Other income (expense)        
Equity in earnings in subsidiaries (49,899) (148,357) (28,269) (410,775)
Income (loss) before income taxes (49,899) (148,357) (28,269) (410,775)
Net income (loss) $ (49,899) $ (148,357) $ (28,269) $ (410,775)