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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statement Of Cash Flows) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 110,798 $ 92,791
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 140,783 47,771
Impairment of oil and gas properties 2,607 3,313
Deferred income taxes 66,648 55,015
Derivative instruments (33,568) (67,105)
Stock-based compensation expenses 6,627 2,592
Debt discount amortization and other 2,038 1,041
Working capital and other changes:    
Change in accounts receivable (69,163) (41,286)
Change in inventory (26,790) (1,850)
Change in prepaid expenses (2,009) (297)
Change in other current assets 413 (337)
Change in other assets (119) (103)
Change in accounts payable and accrued liabilities 79,079 47,820
Change in other current liabilities 4,784  
Change in other liabilities   317
Net cash provided by (used in) operating activities 282,128 139,682
Cash flows from investing activities:    
Capital expenditures (777,426) (386,927)
Derivative settlements 2,784 (4,831)
Purchases of short-term investments (126,213) (164,913)
Redemptions of short-term investments 19,994 39,974
Advances to joint interest partners (90) (408)
Advances from joint interest partners 17,508 8,093
Net cash used in investing activities (863,443) (509,012)
Cash flows from financing activities:    
Proceeds from issuance of senior notes 400,000 400,000
Purchases of treasury stock (1,299) (562)
Debt issuance costs (7,955) (10,027)
Net cash provided by (used in) financing activities 390,746 389,411
Decrease in cash and cash equivalents (190,569) 20,081
Cash and cash equivalents at beginning of period 470,872 143,520
Cash and cash equivalents at end of period 280,303 163,601
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 110,798 92,791
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (145,021) (105,832)
Deferred income taxes (20,458) (7,785)
Stock-based compensation expenses 6,397 2,592
Debt discount amortization and other 1,616 793
Working capital and other changes:    
Change in accounts receivable (203) (80)
Change in prepaid expenses (192) (227)
Change in other current assets (60) (337)
Change in other assets (24) (100)
Change in accounts payable and accrued liabilities 8,620 5,864
Net cash provided by (used in) operating activities (38,527) (12,321)
Cash flows from investing activities:    
Purchases of short-term investments (126,213) (164,913)
Redemptions of short-term investments 19,994 39,974
Net cash used in investing activities (106,219) (124,939)
Cash flows from financing activities:    
Proceeds from issuance of senior notes 400,000 400,000
Purchases of treasury stock (1,299) (562)
Debt issuance costs (7,255) (9,650)
Investment in / capital contributions from affiliates (459,012) (252,138)
Net cash provided by (used in) financing activities (67,566) 137,650
Decrease in cash and cash equivalents (212,312) 390
Cash and cash equivalents at beginning of period 443,482 119,940
Cash and cash equivalents at end of period 231,170 120,330
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 145,021 105,832
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 140,783 47,771
Impairment of oil and gas properties 2,607 3,313
Deferred income taxes 87,106 62,800
Derivative instruments (33,568) (67,105)
Stock-based compensation expenses 230  
Debt discount amortization and other 422 248
Working capital and other changes:    
Change in accounts receivable (70,899) (42,306)
Change in inventory (26,790) (1,850)
Change in prepaid expenses (1,817) (70)
Change in other current assets 473  
Change in other assets (95) (3)
Change in accounts payable and accrued liabilities 72,398 43,056
Change in other current liabilities 4,784  
Change in other liabilities   317
Net cash provided by (used in) operating activities 320,655 152,003
Cash flows from investing activities:    
Capital expenditures (777,426) (386,927)
Derivative settlements 2,784 (4,831)
Advances to joint interest partners (90) (408)
Advances from joint interest partners 17,508 8,093
Net cash used in investing activities (757,224) (384,073)
Cash flows from financing activities:    
Debt issuance costs (700) (377)
Investment in / capital contributions from affiliates 459,012 252,138
Net cash provided by (used in) financing activities 458,312 251,761
Decrease in cash and cash equivalents 21,743 19,691
Cash and cash equivalents at beginning of period 27,390 23,580
Cash and cash equivalents at end of period 49,133 43,271
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (145,021) (105,832)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 145,021 105,832
Working capital and other changes:    
Change in accounts receivable 1,939 1,100
Change in accounts payable and accrued liabilities $ (1,939) $ (1,100)