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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues        
Oil and gas revenues $ 145,203 $ 67,206 $ 283,109 $ 125,950
Well services revenues 3,861   4,521  
Total revenues 149,064 67,206 287,630 125,950
Oil and gas revenues 145,203 67,206 283,109 125,950
Expenses        
Lease operating expenses 12,029 5,951 21,845 11,581
Well services operating expenses 1,207   1,684  
Marketing, transportation and gathering expenses 1,970 247 4,539 559
Production taxes 13,720 7,085 26,986 13,168
Depreciation, depletion and amortization 44,213 13,100 83,099 26,912
Exploration expenses   259 2,835 291
Impairment of oil and gas properties 2,203 1,536 2,571 2,917
General and administrative expenses 13,537 6,614 25,736 12,564
Total expenses 88,879 34,792 169,295 67,992
Operating income 60,185 32,414 118,335 57,958
Other income (expense)        
Net gain (loss)on derivative instruments 74,595 27,547 56,009 (4,119)
Interest expense (14,074) (6,761) (27,973) (11,959)
Other income 776 379 1,374 691
Total other income (expense) 61,297 21,165 29,410 (15,387)
Income before income taxes 121,482 53,579 147,745 42,571
Income tax benefit (expense) (45,439) (20,230) (55,261) (16,069)
Net income 76,043 33,349 92,484 26,502
Parent/Issuer [Member]
        
Expenses        
General and administrative expenses 2,644 1,318 5,090 2,581
Total expenses 2,644 1,318 5,090 2,581
Operating income (2,644) (1,318) (5,090) (2,581)
Other income (expense)        
Equity in earnings in subsidiaries 86,024 37,557 112,286 34,387
Interest expense (13,414) (6,473) (26,829) (11,414)
Other income 118 371 295 664
Total other income (expense) 72,728 31,455 85,752 23,637
Income before income taxes 70,084 30,137 80,662 21,056
Income tax benefit (expense) 5,959 3,212 11,822 5,446
Net income 76,043 33,349 92,484 26,502
Combined Guarantor Subsidiaries [Member]
        
Revenues        
Oil and gas revenues 145,203 67,206 283,109 125,950
Well services revenues 3,861   4,521  
Total revenues 149,064   287,630  
Oil and gas revenues 145,203 67,206 283,109 125,950
Expenses        
Lease operating expenses 12,029 5,951 21,845 11,581
Well services operating expenses 1,207   1,684  
Marketing, transportation and gathering expenses 1,970 247 4,539 559
Production taxes 13,720 7,085 26,986 13,168
Depreciation, depletion and amortization 44,213 13,100 83,099 26,912
Exploration expenses   259 2,835 291
Impairment of oil and gas properties 2,203 1,536 2,571 2,917
General and administrative expenses 10,893 5,296 20,646 9,983
Total expenses 86,235 33,474 164,205 65,411
Operating income 62,829 33,732 123,425 60,539
Other income (expense)        
Net gain (loss)on derivative instruments 74,595 27,547 56,009 (4,119)
Interest expense (660) (288) (1,144) (545)
Other income 658 8 1,079 27
Total other income (expense) 74,593 27,267 55,944 (4,637)
Income before income taxes 137,422 60,999 179,369 55,902
Income tax benefit (expense) (51,398) (23,442) (67,083) (21,515)
Net income 86,024 37,557 112,286 34,387
Intercompany Eliminations [Member]
        
Other income (expense)        
Equity in earnings in subsidiaries (86,024) (37,557) (112,286) (34,387)
Total other income (expense) (86,024) (37,557) (112,286) (34,387)
Income before income taxes (86,024) (37,557) (112,286) (34,387)
Net income $ (86,024) $ (37,557) $ (112,286) $ (34,387)