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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues        
Oil and gas revenues $ 241,842 $ 145,203 $ 483,493 $ 283,109
Well services and midstream revenues 12,740 3,861 19,393 4,521
Total revenues 254,582 149,064 502,886 287,630
Expenses        
Lease operating expenses 18,266 12,029 37,755 21,845
Well services and midstream operating expenses 6,644 1,207 9,558 1,684
Marketing, transportation and gathering expenses 10,779 1,970 14,168 4,539
Production taxes 21,397 13,720 43,486 26,986
Depreciation, depletion and amortization 66,790 44,213 133,051 83,099
Exploration expenses 392 0 2,249 2,835
Impairment of oil and gas properties 208 2,203 706 2,571
General and administrative expenses 16,656 13,537 30,510 25,736
Total expenses 141,132 88,879 271,483 169,295
Operating income (loss) 113,450 60,185 231,403 118,335
Other income (expense)        
Equity in earnings in subsidiaries         
Net gain (loss) on derivative instruments 12,591 74,595 (2,021) 56,009
Interest expense, net of capitalized interest (21,392) (14,074) (42,575) (27,973)
Other income 294 776 1,074 1,374
Total other income (expense) (8,507) 61,297 (43,522) 29,410
Income before income taxes 104,943 121,482 187,881 147,745
Income tax benefit (expense) (37,824) (45,439) (68,911) (55,261)
Net income 67,119 76,043 118,970 92,484
Parent/Issuer [Member]
        
Expenses        
General and administrative expenses 3,524 2,644 6,400 5,090
Total expenses 3,524 2,644 6,400 5,090
Operating income (loss) (3,524) (2,644) (6,400) (5,090)
Other income (expense)        
Equity in earnings in subsidiaries 82,506 86,024 148,751 112,286
Interest expense, net of capitalized interest (20,159) (13,414) (40,678) (26,829)
Other income (738) 118 (363) 295
Total other income (expense) 61,609 72,728 107,710 85,752
Income before income taxes 58,085 70,084 101,310 80,662
Income tax benefit (expense) 9,034 5,959 17,660 11,822
Net income 67,119 76,043 118,970 92,484
Combined Guarantor Subsidiaries [Member]
        
Revenues        
Oil and gas revenues 241,842 145,203 483,493 283,109
Well services and midstream revenues 12,740 3,861 19,393 4,521
Total revenues 254,582 149,064 502,886 287,630
Expenses        
Lease operating expenses 18,266 12,029 37,755 21,845
Well services and midstream operating expenses 6,644 1,207 9,558 1,684
Marketing, transportation and gathering expenses 10,779 1,970 14,168 4,539
Production taxes 21,397 13,720 43,486 26,986
Depreciation, depletion and amortization 66,790 44,213 133,051 83,099
Exploration expenses 392   2,249 2,835
Impairment of oil and gas properties 208 2,203 706 2,571
General and administrative expenses 13,132 10,893 24,110 20,646
Total expenses 137,608 86,235 265,083 164,205
Operating income (loss) 116,974 62,829 237,803 123,425
Other income (expense)        
Equity in earnings in subsidiaries         
Net gain (loss) on derivative instruments 12,591 74,595 (2,021) 56,009
Interest expense, net of capitalized interest (1,233) (660) (1,897) (1,144)
Other income 1,032 658 1,437 1,079
Total other income (expense) 12,390 74,593 (2,481) 55,944
Income before income taxes 129,364 137,422 235,322 179,369
Income tax benefit (expense) (46,858) (51,398) (86,571) (67,083)
Net income 82,506 86,024 148,751 112,286
Intercompany Eliminations [Member]
        
Other income (expense)        
Equity in earnings in subsidiaries (82,506) (86,024) (148,751) (112,286)
Total other income (expense) (82,506) (86,024) (148,751) (112,286)
Income before income taxes (82,506) (86,024) (148,751) (112,286)
Net income $ (82,506) $ (86,024) $ (148,751) $ (112,286)