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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 118,970,000 $ 92,484,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 133,051,000 83,099,000
Impairment of oil and gas properties 706,000 2,571,000
Deferred income taxes 67,974,000 55,161,000
Derivative instruments 2,021,000 (56,009,000)
Stock-based compensation expenses 5,371,000 3,898,000
Debt discount amortization and other 1,753,000 1,265,000
Working capital and other changes:    
Change in accounts receivable (13,768,000) (26,840,000)
Change in inventory (4,200,000) (21,636,000)
Change in prepaid expenses (4,402,000) 1,500,000
Change in other current assets 330,000 490,000
Change in other assets 0 (7,365,000)
Change in accounts payable and accrued liabilities 48,701,000 40,022,000
Change in other current liabilities 688,000 2,470,000
Change in other liabilities 612,000 750,000
Net cash provided by operating activities 357,807,000 171,860,000
Cash flows from investing activities:    
Capital expenditures (429,296,000) (440,781,000)
Derivative settlements 2,932,000 (2,465,000)
Redemptions of short-term investments 25,000,000 19,994,000
Advances to joint interest partners 666,000 1,978,000
Advances from joint interest partners (5,593,000) 19,380,000
Net cash used in investing activities (406,291,000) (401,894,000)
Cash flows from financing activities:    
Purchases of treasury stock (364,000) (1,206,000)
Debt issuance costs (2,998,000) (746,000)
Investment in / capital contributions from affiliates     
Net cash used in financing activities (3,362,000) (1,952,000)
Decrease in cash and cash equivalents (51,846,000) (231,986,000)
Beginning of period 213,447,000 470,872,000
End of period 161,601,000 238,886,000
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 118,970,000 92,484,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (148,751,000) (112,286,000)
Deferred income taxes (17,660,000) (11,822,000)
Stock-based compensation expenses 5,263,000 3,793,000
Debt discount amortization and other 2,189,000 960,000
Working capital and other changes:    
Change in accounts receivable (461,000) (178,000)
Change in prepaid expenses 313,000 246,000
Change in other current assets 232,000 17,000
Change in other assets   (7,305,000)
Change in accounts payable and accrued liabilities (388,000) 9,657,000
Net cash provided by operating activities (40,293,000) (24,434,000)
Cash flows from investing activities:    
Redemptions of short-term investments 25,000,000 19,994,000
Net cash used in investing activities 25,000,000 19,994,000
Cash flows from financing activities:    
Purchases of treasury stock (364,000) (1,206,000)
Debt issuance costs   (46,000)
Investment in / capital contributions from affiliates (34,370,000) (242,130,000)
Net cash used in financing activities (34,734,000) (243,382,000)
Decrease in cash and cash equivalents (50,027,000) (247,822,000)
Beginning of period 133,797,000 443,482,000
End of period 83,770,000 195,660,000
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 148,751,000 112,286,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 133,051,000 83,099,000
Impairment of oil and gas properties 706,000 2,571,000
Deferred income taxes 85,634,000 66,983,000
Derivative instruments 2,021,000 (56,009,000)
Stock-based compensation expenses 108,000 105,000
Debt discount amortization and other (436,000) 305,000
Working capital and other changes:    
Change in accounts receivable (13,972,000) (28,661,000)
Change in inventory (4,200,000) (21,636,000)
Change in prepaid expenses (4,715,000) 1,254,000
Change in other current assets 98,000 473,000
Change in other assets   (60,000)
Change in accounts payable and accrued liabilities 49,754,000 32,364,000
Change in other current liabilities 688,000 2,470,000
Change in other liabilities 612,000 750,000
Net cash provided by operating activities 398,100,000 196,294,000
Cash flows from investing activities:    
Capital expenditures (429,296,000) (440,781,000)
Derivative settlements 2,932,000 (2,465,000)
Advances to joint interest partners 666,000 1,978,000
Advances from joint interest partners (5,593,000) 19,380,000
Net cash used in investing activities (431,291,000) (421,888,000)
Cash flows from financing activities:    
Debt issuance costs (2,998,000) (700,000)
Investment in / capital contributions from affiliates 34,370,000 242,130,000
Net cash used in financing activities 31,372,000 241,430,000
Decrease in cash and cash equivalents (1,819,000) 15,836,000
Beginning of period 79,650,000 27,390,000
End of period 77,831,000 43,226,000
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (148,751,000) (112,286,000)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 148,751,000 112,286,000
Working capital and other changes:    
Change in accounts receivable 665,000 1,999,000
Change in accounts payable and accrued liabilities $ (665,000) $ (1,999,000)