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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, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 330,373 $ 173,469
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 295,520 205,779
Gain on sale of properties (187,076) 0
Impairment of oil and gas properties 2,243 762
Deferred income taxes 197,548 102,244
Derivative instruments (20,253) 41,838
Stock-based compensation expenses 15,755 8,411
Deferred financing costs amortization and other 5,209 2,693
Working capital and other changes:    
Change in accounts receivable (62,581) (67,487)
Change in inventory (4,089) (8,820)
Change in prepaid expenses (3,179) (5,175)
Change in other current assets (1,581) (138)
Change in other assets (3,069) (63)
Change in accounts payable and accrued liabilities 108,788 82,246
Change in other liabilities (116) 922
Net cash provided by operating activities 673,492 536,681
Cash flows from investing activities:    
Capital expenditures (972,763) (654,175)
Acquisition of oil and gas properties (26,126) (133,061)
Increase in restricted cash 0 (986,210)
Proceeds from sale of properties 324,938 0
Costs related to sale of properties (2,337) 0
Derivative settlements (24,773) (5,135)
Redemptions of short-term investments   25,000
Advances from joint interest partners (6,053) (7,965)
Net cash used in investing activities (707,114) (1,761,546)
Cash flows from financing activities:    
Proceeds from issuance of senior notes 0 1,000,000
Proceeds from revolving credit facility 370,000 160,000
Principal payments on revolving credit facility (355,570) 0
Debt issuance costs (99) (21,718)
Purchases of treasury stock (5,240) (1,424)
Other (176) 0
Net cash provided by financing activities 8,915 1,136,858
Decrease in cash and cash equivalents (24,707) (88,007)
Beginning of period 91,901 213,447
End of period 67,194 125,440
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 330,373 173,469
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (410,775) (218,869)
Deferred income taxes (48,238) (27,049)
Stock-based compensation expenses 15,398 8,196
Deferred financing costs amortization and other 3,400 2,850
Working capital and other changes:    
Change in accounts receivable (11) (460)
Change in prepaid expenses (127) (164)
Change in other current assets   233
Change in accounts payable and accrued liabilities 45,881 (4,758)
Net cash provided by operating activities (64,099) (66,552)
Cash flows from investing activities:    
Increase in restricted cash   (986,210)
Redemptions of short-term investments   25,000
Net cash used in investing activities 0 (961,210)
Cash flows from financing activities:    
Proceeds from issuance of senior notes   1,000,000
Debt issuance costs   (15,340)
Purchases of treasury stock (5,240) (1,424)
Investment in / capital contributions from affiliates 36,015 (56,316)
Other (176)  
Net cash provided by financing activities 30,599 926,920
Decrease in cash and cash equivalents (33,500) (100,842)
Beginning of period 34,277 133,797
End of period 777 32,955
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 410,775 218,869
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 295,520 205,779
Gain on sale of properties (187,076)  
Impairment of oil and gas properties 2,243 762
Deferred income taxes 245,786 129,293
Derivative instruments (20,253) 41,838
Stock-based compensation expenses 357 215
Deferred financing costs amortization and other 1,809 (157)
Working capital and other changes:    
Change in accounts receivable (131,523) (69,614)
Change in inventory (4,089) (8,820)
Change in prepaid expenses (3,052) (5,011)
Change in other current assets (1,581) (371)
Change in other assets (3,069) (63)
Change in accounts payable and accrued liabilities 131,860 89,591
Change in other liabilities (116) 922
Net cash provided by operating activities 737,591 603,233
Cash flows from investing activities:    
Capital expenditures (972,763) (654,175)
Acquisition of oil and gas properties (26,126) (133,061)
Proceeds from sale of properties 324,938  
Costs related to sale of properties (2,337)  
Derivative settlements (24,773) (5,135)
Advances from joint interest partners (6,053) (7,965)
Net cash used in investing activities (707,114) (800,336)
Cash flows from financing activities:    
Proceeds from revolving credit facility 370,000 160,000
Principal payments on revolving credit facility (355,570)  
Debt issuance costs (99) (6,378)
Investment in / capital contributions from affiliates (36,015) 56,316
Net cash provided by financing activities (21,684) 209,938
Decrease in cash and cash equivalents 8,793 12,835
Beginning of period 57,624 79,650
End of period 66,417 92,485
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (410,775) (218,869)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 410,775 218,869
Working capital and other changes:    
Change in accounts receivable 68,953 2,587
Change in accounts payable and accrued liabilities $ (68,953) $ (2,587)