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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, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 173,469 $ 110,798
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 205,779 140,783
Impairment of oil and gas properties 762 2,607
Deferred income taxes 102,244 66,648
Derivative instruments 41,838 (33,568)
Stock-based compensation expenses 8,411 6,627
Debt discount amortization and other 2,693 2,038
Working capital and other changes:    
Change in accounts receivable (67,487) (69,163)
Change in inventory (8,820) (26,790)
Change in prepaid expenses (5,175) (2,009)
Change in other current assets (138) 413
Change in other assets (63) (119)
Change in accounts payable and accrued liabilities 82,246 79,079
Change in other current liabilities 0 4,784
Change in other liabilities 922 0
Net cash provided by operating activities 536,681 282,128
Cash flows from investing activities:    
Capital expenditures (654,175) (777,516)
Acquisition of oil and gas properties (133,061) 0
Increase in restricted cash (986,210) 0
Derivative settlements (5,135) 2,784
Purchases of short-term investments 0 (126,213)
Redemptions of short-term investments 25,000 19,994
Advances from joint interest partners (7,965) 17,508
Net cash used in investing activities (1,761,546) (863,443)
Cash flows from financing activities:    
Proceeds from credit facility 160,000 0
Proceeds from issuance of senior notes 1,000,000 400,000
Purchases of treasury stock (1,424) (1,299)
Debt issuance costs (21,718) (7,955)
Investment in / capital contributions from affiliates 0   
Net cash provided by financing activities 1,136,858 390,746
Decrease in cash and cash equivalents (88,007) (190,569)
Beginning of period 213,447 470,872
End of period 125,440 280,303
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 173,469 110,798
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (218,869) (145,021)
Deferred income taxes (27,049) (20,458)
Stock-based compensation expenses 8,196 6,397
Debt discount amortization and other 2,850 1,616
Working capital and other changes:    
Change in accounts receivable (460) (203)
Change in prepaid expenses (164) (192)
Change in other current assets 233 (60)
Change in other assets   (24)
Change in accounts payable and accrued liabilities (4,758) 8,620
Net cash provided by operating activities (66,552) (38,527)
Cash flows from investing activities:    
Increase in restricted cash (986,210)  
Purchases of short-term investments   (126,213)
Redemptions of short-term investments 25,000 19,994
Net cash used in investing activities (961,210) (106,219)
Cash flows from financing activities:    
Proceeds from issuance of senior notes 1,000,000 400,000
Purchases of treasury stock (1,424) (1,299)
Debt issuance costs (15,340) (7,255)
Investment in / capital contributions from affiliates (56,316) (459,012)
Net cash provided by financing activities 926,920 (67,566)
Decrease in cash and cash equivalents (100,842) (212,312)
Beginning of period 133,797 443,482
End of period 32,955 231,170
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 218,869 145,021
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 205,779 140,783
Impairment of oil and gas properties 762 2,607
Deferred income taxes 129,293 87,106
Derivative instruments 41,838 (33,568)
Stock-based compensation expenses 215 230
Debt discount amortization and other (157) 422
Working capital and other changes:    
Change in accounts receivable (69,614) (70,899)
Change in inventory (8,820) (26,790)
Change in prepaid expenses (5,011) (1,817)
Change in other current assets (371) 473
Change in other assets (63) (95)
Change in accounts payable and accrued liabilities 89,591 72,398
Change in other current liabilities   4,784
Change in other liabilities 922  
Net cash provided by operating activities 603,233 320,655
Cash flows from investing activities:    
Capital expenditures (654,175) (777,516)
Acquisition of oil and gas properties (133,061)  
Derivative settlements (5,135) 2,784
Advances from joint interest partners (7,965) 17,508
Net cash used in investing activities (800,336) (757,224)
Cash flows from financing activities:    
Proceeds from credit facility 160,000  
Debt issuance costs (6,378) (700)
Investment in / capital contributions from affiliates 56,316 459,012
Net cash provided by financing activities 209,938 458,312
Decrease in cash and cash equivalents 12,835 21,743
Beginning of period 79,650 27,390
End of period 92,485 49,133
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (218,869) (145,021)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 218,869 145,021
Working capital and other changes:    
Change in accounts receivable 2,587 1,939
Change in accounts payable and accrued liabilities $ (2,587) $ (1,939)