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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues        
Oil and gas revenues $ 354,182 $ 241,842 $ 686,029 $ 483,493
Well services and midstream revenues 18,196 12,740 35,868 19,393
Total revenues 372,378 254,582 721,897 502,886
Expenses        
Lease operating expenses 40,553 18,266 80,542 37,755
Well services and midstream operating expenses 8,769 6,644 19,689 9,558
Marketing, transportation and gathering expenses 7,114 10,779 12,300 14,168
Production taxes 34,493 21,397 66,296 43,486
Depreciation, depletion and amortization 97,276 66,790 188,548 133,051
Exploration expenses 475 392 855 2,249
Impairment of oil and gas properties 42 208 804 706
General and administrative expenses 20,751 16,656 44,271 30,510
Total expenses 209,473 141,132 413,305 271,483
Gain on sale of properties 3,640 0 187,033 0
Operating income (loss) 166,545 113,450 495,625 231,403
Other income (expense)        
Net gain (loss) on derivative instruments (65,570) 12,591 (83,173) (2,021)
Interest expense, net of capitalized interest (38,990) (21,392) (79,148) (42,575)
Other income (expense) 135 294 288 1,074
Total other income (expense) (104,425) (8,507) (162,033) (43,522)
Income before income taxes 62,120 104,943 333,592 187,881
Income tax benefit (expense) (23,287) (37,824) (124,806) (68,911)
Net income 38,833 67,119 208,786 118,970
Parent/Issuer [Member]
        
Expenses        
General and administrative expenses 5,805 3,524 11,417 6,400
Total expenses 5,805 3,524 11,417 6,400
Operating income (loss) (5,805) (3,524) (11,417) (6,400)
Other income (expense)        
Equity in earnings in subsidiaries 65,485 82,506 262,418 148,751
Interest expense, net of capitalized interest (36,705) (20,159) (74,129) (40,678)
Other income (expense)   (738) 3 (363)
Total other income (expense) 28,780 61,609 188,292 107,710
Income before income taxes 22,975 58,085 176,875 101,310
Income tax benefit (expense) 15,858 9,034 31,911 17,660
Net income 38,833 67,119 208,786 118,970
Combined Guarantor Subsidiaries [Member]
        
Revenues        
Oil and gas revenues 354,182 241,842 686,029 483,493
Well services and midstream revenues 18,196 12,740 35,868 19,393
Total revenues 372,378 254,582 721,897 502,886
Expenses        
Lease operating expenses 40,553 18,266 80,542 37,755
Well services and midstream operating expenses 8,769 6,644 19,689 9,558
Marketing, transportation and gathering expenses 7,114 10,779 12,300 14,168
Production taxes 34,493 21,397 66,296 43,486
Depreciation, depletion and amortization 97,276 66,790 188,548 133,051
Exploration expenses 475 392 855 2,249
Impairment of oil and gas properties 42 208 804 706
General and administrative expenses 14,946 13,132 32,854 24,110
Total expenses 203,668 137,608 401,888 265,083
Gain on sale of properties 3,640   187,033  
Operating income (loss) 172,350 116,974 507,042 237,803
Other income (expense)        
Net gain (loss) on derivative instruments (65,570) 12,591 (83,173) (2,021)
Interest expense, net of capitalized interest (2,285) (1,233) (5,019) (1,897)
Other income (expense) 135 1,032 285 1,437
Total other income (expense) (67,720) 12,390 (87,907) (2,481)
Income before income taxes 104,630 129,364 419,135 235,322
Income tax benefit (expense) (39,145) (46,858) (156,717) (86,571)
Net income 65,485 82,506 262,418 148,751
Intercompany Eliminations [Member]
        
Other income (expense)        
Equity in earnings in subsidiaries (65,485) (82,506) (262,418) (148,751)
Total other income (expense) (65,485) (82,506) (262,418) (148,751)
Income before income taxes (65,485) (82,506) (262,418) (148,751)
Net income $ (65,485) $ (82,506) $ (262,418) $ (148,751)