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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues        
Total revenues $ 230,046 $ 372,378 $ 410,433 $ 721,897
Operating expenses        
General and administrative expenses 21,508 20,751 44,832 44,271
Other operating expenses   188,722 406,673 369,034
Total operating expenses 237,483 209,473 451,505 413,305
Gain on sale of properties 0 3,640 0 187,033
Operating income (loss) (7,437) 166,545 (41,072) 495,625
Other income (expense)        
Interest expense, net of capitalized interest (37,405) (38,990) (76,189) (79,148)
Other income (expense) (76,638) (65,435) 7,769 (82,885)
Income (loss) before income taxes (84,075) 62,120 (109,492) 333,592
Income tax benefit (expense) 30,845 (23,287) 38,221 (124,806)
Net income (loss) (53,230) 38,833 (71,271) 208,786
Parent/Issuer [Member]        
Operating expenses        
General and administrative expenses   5,805 14,944 11,417
Total operating expenses 6,325      
Operating income (loss) (6,325) (5,805) (14,944) (11,417)
Other income (expense)        
Equity in earnings in subsidiaries (34,249) 65,485 (21,630) 262,418
Interest expense, net of capitalized interest   (36,705) (69,415) (74,129)
Other income (expense) (34,189)   4 3
Income (loss) before income taxes (74,763) 22,975 (105,985) 176,875
Income tax benefit (expense) 21,533 15,858 34,714 31,911
Net income (loss) (53,230) 38,833 (71,271) 208,786
Combined Guarantor Subsidiaries [Member]        
Revenues        
Total revenues 230,046 372,378 410,433 721,897
Operating expenses        
General and administrative expenses   14,946 29,888 32,854
Other operating expenses   188,722 406,673 369,034
Total operating expenses 231,158      
Gain on sale of properties   3,640   187,033
Operating income (loss) (1,112) 172,350 (26,128) 507,042
Other income (expense)        
Interest expense, net of capitalized interest   (2,285) (6,774) (5,019)
Other income (expense) (42,449) (65,435) 7,765 (82,888)
Income (loss) before income taxes (43,561) 104,630 (25,137) 419,135
Income tax benefit (expense) 9,312 (39,145) 3,507 (156,717)
Net income (loss) (34,249) 65,485 (21,630) 262,418
Intercompany Eliminations [Member]        
Other income (expense)        
Equity in earnings in subsidiaries 34,249 (65,485) 21,630 (262,418)
Income (loss) before income taxes 34,249 (65,485) 21,630 (262,418)
Net income (loss) $ 34,249 $ (65,485) $ 21,630 $ (262,418)