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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statement Of Cash Flows) (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 92,484 $ 26,502
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 83,099 26,912
Impairment of oil and gas properties 2,571 2,917
Deferred income taxes 55,161 16,069
Derivative instruments (56,009) 4,119
Stock-based compensation expenses 3,898 1,571
Debt discount amortization and other 1,265 648
Working capital and other changes:    
Change in accounts receivable (26,840) (19,945)
Change in inventory (21,636) (65)
Change in prepaid expenses 1,500 (254)
Change in other current assets 490 (211)
Change in other assets (7,365) (103)
Change in accounts payable and accrued liabilities 40,022 43,612
Change in other current liabilities 2,470  
Change in other liabilities 750 323
Net cash provided by (used in) operating activities 171,860 102,095
Cash flows from investing activities:    
Capital expenditures (440,781) (212,267)
Derivative settlements (2,465) (4,652)
Purchases of short-term investments   (164,913)
Redemptions of short-term investments 19,994 39,974
Advances to joint interest partners 1,978 983
Advances from joint interest partners 19,380 5,851
Net cash provided by (used in) investing activities (401,894) (335,024)
Cash flows from financing activities:    
Proceeds from issuance of senior notes   400,000
Purchases of treasury stock (1,206) (559)
Debt issuance costs (746) (10,027)
Net cash (used in) provided by financing activities (1,952) 389,414
Increase (decrease) in cash and cash equivalents (231,986) 156,485
Beginning of period 470,872 143,520
End of period 238,886 300,005
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 92,484 26,502
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (112,286) (34,387)
Deferred income taxes (11,822) (5,446)
Stock-based compensation expenses 3,793 1,571
Debt discount amortization and other 960 489
Working capital and other changes:    
Change in accounts receivable (178)  
Change in prepaid expenses 246 (382)
Change in other current assets 17 (211)
Change in other assets (7,305) (100)
Change in accounts payable and accrued liabilities 9,657 13,013
Net cash provided by (used in) operating activities (24,434) 1,049
Cash flows from investing activities:    
Purchases of short-term investments   (164,913)
Redemptions of short-term investments 19,994 39,974
Net cash provided by (used in) investing activities 19,994 (124,939)
Cash flows from financing activities:    
Proceeds from issuance of senior notes   400,000
Purchases of treasury stock (1,206) (559)
Debt issuance costs (46) (9,650)
Investment in / capital contributions from affiliates (242,130) (111,078)
Net cash (used in) provided by financing activities (243,382) 278,713
Increase (decrease) in cash and cash equivalents (247,822) 154,823
Beginning of period 443,482 119,940
End of period 195,660 274,763
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 112,286 34,387
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 83,099 26,912
Impairment of oil and gas properties 2,571 2,917
Deferred income taxes 66,983 21,515
Derivative instruments (56,009) 4,119
Stock-based compensation expenses 105  
Debt discount amortization and other 305 159
Working capital and other changes:    
Change in accounts receivable (28,661) (20,940)
Change in inventory (21,636) (65)
Change in prepaid expenses 1,254 128
Change in other current assets 473  
Change in other assets (60) (3)
Change in accounts payable and accrued liabilities 32,364 31,594
Change in other current liabilities 2,470  
Change in other liabilities 750 323
Net cash provided by (used in) operating activities 196,294 101,046
Cash flows from investing activities:    
Capital expenditures (440,781) (212,267)
Derivative settlements (2,465) (4,652)
Advances to joint interest partners 1,978 983
Advances from joint interest partners 19,380 5,851
Net cash provided by (used in) investing activities (421,888) (210,085)
Cash flows from financing activities:    
Debt issuance costs (700) (377)
Investment in / capital contributions from affiliates 242,130 111,078
Net cash (used in) provided by financing activities 241,430 110,701
Increase (decrease) in cash and cash equivalents 15,836 1,662
Beginning of period 27,390 23,580
End of period 43,226 25,242
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (112,286) (34,387)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 112,286 34,387
Working capital and other changes:    
Change in accounts receivable 1,999 995
Change in accounts payable and accrued liabilities $ (1,999) $ (995)