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Consolidating Financial Statements - Schedule of Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 153,388 $ 79,390 $ (29,695)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, depletion and amortization 206,734 74,981 37,832
Impairment of oil and gas properties 3,581 3,610 11,967
Loss on sale of properties   207  
Deferred income taxes 92,479 46,789 42,962
Derivative instruments (34,164) (1,595) 7,653
Stock-based compensation expenses 10,333 3,656 9,970
Debt discount amortization and other 2,810 1,561 470
Working capital and other changes:      
Change in accounts receivable (90,103) (64,900) (44,450)
Change in inventory (29,313) (2,550) (498)
Change in prepaid expenses 346 (1,600) (356)
Change in other current assets 156 (491)  
Change in other assets (95) (139) (164)
Change in accounts payable and accrued liabilities 76,706 36,316 13,917
Change in other current liabilities (472) 472  
Change in other liabilities   317 4
Net cash provided by (used in) operating activities 392,386 176,024 49,612
Cash flows from investing activities:      
Capital expenditures (1,053,315) (613,223) (226,544)
Acquisition of oil and gas properties     (86,393)
Derivative settlements 6,545 (3,841) (120)
Purchases of short-term investments (126,213) (184,907)  
Redemptions of short-term investments 120,316 164,913  
Advances to joint interest partners 1,950 (497) 1,010
Advances from joint interest partners 12,112 5,963 2,512
Proceeds from equipment and property sales   2,202  
Net cash used in investing activities (1,038,605) (629,390) (309,535)
Cash flows from financing activities:      
Proceeds from issuance of senior notes 400,000 800,000  
Proceeds from sale of common stock     399,669
Purchases of treasury stock (3,194) (602)  
Proceeds from credit facility     72,000
Principal payments on credit facility     (107,000)
Debt issuance costs (8,012) (18,680) (1,788)
Net cash provided by financing activities 388,794 780,718 362,881
Increase (decrease) in cash and cash equivalents (257,425) 327,352 102,958
Cash and cash equivalents at beginning of period 470,872 143,520 40,562
Cash and cash equivalents at end of period 213,447 470,872 143,520
Parent/Issuer [Member]
      
Cash flows from operating activities:      
Net income 153,388 79,390 (29,695)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in earnings of subsidiaries (202,924) (99,836) 28,124
Depreciation, depletion and amortization         
Impairment of oil and gas properties         
Loss on sale of properties       
Deferred income taxes (29,588) (12,204) (954)
Derivative instruments         
Stock-based compensation expenses 10,219 3,656 1,227
Debt discount amortization and other 2,277 1,196   
Working capital and other changes:      
Change in accounts receivable (222) (88)   
Change in inventory         
Change in prepaid expenses (4) (73) (236)
Change in other current assets (217) (18)  
Change in other assets 25 (100)   
Change in accounts payable and accrued liabilities 18,612 17,127 306
Change in other current liabilities        
Change in other liabilities        
Net cash provided by (used in) operating activities (48,434) (10,950) (1,228)
Cash flows from investing activities:      
Capital expenditures         
Acquisition of oil and gas properties       
Derivative settlements         
Purchases of short-term investments (126,213) (184,907)  
Redemptions of short-term investments 120,316 164,913  
Advances to joint interest partners         
Advances from joint interest partners         
Proceeds from equipment and property sales       
Net cash used in investing activities (5,897) (19,994)   
Cash flows from financing activities:      
Proceeds from issuance of senior notes 400,000 800,000  
Proceeds from sale of common stock     399,669
Purchases of treasury stock (3,194) (602)  
Proceeds from credit facility       
Principal payments on credit facility       
Debt issuance costs (7,307) (16,838)   
Investment in / capital contributions from subsidiaries (644,853) (428,074) (278,501)
Net cash provided by financing activities (255,354) 354,486 121,168
Increase (decrease) in cash and cash equivalents (309,685) 323,542 119,940
Cash and cash equivalents at beginning of period 443,482 119,940  
Cash and cash equivalents at end of period 133,797 443,482 119,940
Combined Guarantor Subsidiaries [Member]
      
Cash flows from operating activities:      
Net income 202,924 99,836 (28,124)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in earnings of subsidiaries         
Depreciation, depletion and amortization 206,734 74,981 37,832
Impairment of oil and gas properties 3,581 3,610 11,967
Loss on sale of properties   207  
Deferred income taxes 122,067 58,993 43,916
Derivative instruments (34,164) (1,595) 7,653
Stock-based compensation expenses 114    8,743
Debt discount amortization and other 533 365 470
Working capital and other changes:      
Change in accounts receivable (94,106) (66,134) (44,756)
Change in inventory (29,313) (2,550) (498)
Change in prepaid expenses 350 (1,527) (120)
Change in other current assets 373 (473)  
Change in other assets (120) (39) (164)
Change in accounts payable and accrued liabilities 62,319 20,511 13,917
Change in other current liabilities (472) 472  
Change in other liabilities   317 4
Net cash provided by (used in) operating activities 440,820 186,974 50,840
Cash flows from investing activities:      
Capital expenditures (1,053,315) (613,223) (226,544)
Acquisition of oil and gas properties     (86,393)
Derivative settlements 6,545 (3,841) (120)
Purchases of short-term investments        
Redemptions of short-term investments        
Advances to joint interest partners 1,950 (497) 1,010
Advances from joint interest partners 12,112 5,963 2,512
Proceeds from equipment and property sales   2,202  
Net cash used in investing activities (1,032,708) (609,396) (309,535)
Cash flows from financing activities:      
Proceeds from issuance of senior notes        
Proceeds from sale of common stock       
Purchases of treasury stock        
Proceeds from credit facility     72,000
Principal payments on credit facility     (107,000)
Debt issuance costs (705) (1,842) (1,788)
Investment in / capital contributions from subsidiaries 644,853 428,074 278,501
Net cash provided by financing activities 644,148 426,232 241,713
Increase (decrease) in cash and cash equivalents 52,260 3,810 (16,982)
Cash and cash equivalents at beginning of period 27,390 23,580 40,562
Cash and cash equivalents at end of period 79,650 27,390 23,580
Intercompany Eliminations [Member]
      
Cash flows from operating activities:      
Net income (202,924) (99,836) 28,124
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in earnings of subsidiaries 202,924 99,836 (28,124)
Depreciation, depletion and amortization         
Impairment of oil and gas properties         
Loss on sale of properties       
Deferred income taxes         
Derivative instruments         
Stock-based compensation expenses         
Debt discount amortization and other         
Working capital and other changes:      
Change in accounts receivable 4,225 1,322 306
Change in inventory         
Change in prepaid expenses         
Change in other current assets        
Change in other assets         
Change in accounts payable and accrued liabilities (4,225) (1,322) (306)
Change in other current liabilities        
Change in other liabilities        
Net cash provided by (used in) operating activities         
Cash flows from investing activities:      
Capital expenditures         
Acquisition of oil and gas properties       
Derivative settlements         
Purchases of short-term investments        
Redemptions of short-term investments        
Advances to joint interest partners         
Advances from joint interest partners         
Proceeds from equipment and property sales       
Net cash used in investing activities         
Cash flows from financing activities:      
Proceeds from issuance of senior notes        
Proceeds from sale of common stock       
Purchases of treasury stock        
Proceeds from credit facility       
Principal payments on credit facility       
Debt issuance costs         
Investment in / capital contributions from subsidiaries         
Net cash provided by financing activities         
Increase (decrease) in cash and cash equivalents         
Cash and cash equivalents at beginning of period         
Cash and cash equivalents at end of period