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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 208,786 $ 118,970
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 188,548 133,051
Gain on sale of properties (187,033) 0
Impairment of oil and gas properties 804 706
Deferred income taxes 118,695 67,974
Derivative instruments 83,173 2,021
Stock-based compensation expenses 9,678 5,371
Debt discount amortization and other 3,220 1,753
Working capital and other changes:    
Change in accounts receivable (37,132) (13,768)
Change in inventory 3,016 (4,200)
Change in prepaid expenses 1,284 (4,402)
Change in other current assets (30) 330
Change in other assets (1,477) 0
Change in accounts payable and accrued liabilities 91,543 48,701
Change in other current liabilities 3,311 688
Change in other liabilities (132) 612
Net cash provided by operating activities 486,254 357,807
Cash flows from investing activities:    
Capital expenditures (606,924) (428,630)
Payments to Acquire Oil and Gas Property (8,116) 0
Proceeds from sale of properties 324,888 0
Costs related to sale of properties (2,337) 0
Derivative settlements (13,644) 2,932
Proceeds from Sale, Maturity and Collection of Short-term Investments   25,000
Advances from joint interest partners (5,919) (5,593)
Net cash used in investing activities (312,052) (406,291)
Proceeds from Long-term Lines of Credit 100,000 0
Cash flows from financing activities:    
Principal payments on revolving credit facility 335,570 0
Purchases of treasury stock (3,315) (364)
Debt issuance costs (85) (2,998)
Other (176) 0
Net cash used in financing activities (239,146) (3,362)
Decrease in cash and cash equivalents (64,944) (51,846)
Beginning of period 91,901 213,447
End of period 26,957  
Parent/Issuer [Member]
    
Cash flows from operating activities:    
Net income 208,786 118,970
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (262,418) (148,751)
Deferred income taxes (31,911) (17,660)
Stock-based compensation expenses 9,522 5,263
Debt discount amortization and other 2,255 2,189
Working capital and other changes:    
Change in accounts receivable (11) (461)
Change in prepaid expenses 318 313
Change in other current assets   232
Change in accounts payable and accrued liabilities 6,025 (388)
Net cash provided by operating activities (67,434) (40,293)
Cash flows from investing activities:    
Proceeds from Sale, Maturity and Collection of Short-term Investments   25,000
Net cash used in investing activities 0 25,000
Cash flows from financing activities:    
Purchases of treasury stock (3,315) (364)
Investment in / capital contributions from affiliates 38,251 (34,370)
Other (176)  
Net cash used in financing activities 34,760 (34,734)
Decrease in cash and cash equivalents (32,674) (50,027)
Beginning of period 34,277 133,797
End of period 1,603  
Combined Guarantor Subsidiaries [Member]
    
Cash flows from operating activities:    
Net income 262,418 148,751
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 188,548 133,051
Gain on sale of properties (187,033)  
Impairment of oil and gas properties 804 706
Deferred income taxes 150,606 85,634
Derivative instruments 83,173 2,021
Stock-based compensation expenses 156 108
Debt discount amortization and other 965 (436)
Working capital and other changes:    
Change in accounts receivable (41,448) (13,972)
Change in inventory 3,016 (4,200)
Change in prepaid expenses 966 (4,715)
Change in other current assets (30) 98
Change in other assets (1,477)  
Change in accounts payable and accrued liabilities 89,845 49,754
Change in other current liabilities 3,311 688
Change in other liabilities (132) 612
Net cash provided by operating activities 553,688 398,100
Cash flows from investing activities:    
Capital expenditures (606,924) (428,630)
Payments to Acquire Oil and Gas Property (8,116)  
Proceeds from sale of properties 324,888  
Costs related to sale of properties (2,337)  
Derivative settlements (13,644) 2,932
Advances from joint interest partners (5,919) (5,593)
Net cash used in investing activities (312,052) (431,291)
Proceeds from Long-term Lines of Credit 100,000  
Cash flows from financing activities:    
Principal payments on revolving credit facility 335,570  
Debt issuance costs (85) (2,998)
Investment in / capital contributions from affiliates (38,251) 34,370
Net cash used in financing activities (273,906) 31,372
Decrease in cash and cash equivalents (32,270) (1,819)
Beginning of period 57,624 79,650
End of period 25,354  
Intercompany Eliminations [Member]
    
Cash flows from operating activities:    
Net income (262,418) (148,751)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 262,418 148,751
Working capital and other changes:    
Change in accounts receivable 4,327 665
Change in accounts payable and accrued liabilities $ (4,327) $ (665)