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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 227,959 $ 153,388 $ 79,390
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, depletion and amortization 307,055 206,734 74,981
Impairment of oil and gas properties 1,168 3,581 3,610
Gain (loss) on sale of properties 0 0 207
Deferred income taxes 134,583 92,479 46,789
Derivative, Gain (Loss) on Derivative, Net 35,432 (34,164) (1,595)
Stock-based compensation expenses 11,982 10,333 3,656
Debt discount amortization and other 4,248 2,810 1,561
Working capital and other changes:      
Change in accounts receivable (107,473) (90,103) (64,900)
Increase (Decrease) in Inventories (13,941) (29,313) (2,550)
Increase (Decrease) in Prepaid Expense (8,191) 346 (1,600)
Change in other current assets (56) 156 (491)
Increase (Decrease) in Other Operating Assets (3,248) (95) (139)
Change in accounts payable and accrued liabilities 107,451 76,706 36,316
Change in other current liabilities 0 (472) 472
Change in other liabilities 887 0 317
Net cash provided by operating activities 697,856 392,386 176,024
Cash flows from investing activities:      
Payments to Explore and Develop Oil and Gas Properties (893,524) (1,051,365) (613,720)
Acquisition of oil and gas properties 1,560,072 0 0
Derivative settlements (8,133) 6,545 (3,841)
Purchases of short-term investments 0 (126,213) (184,907)
Redemptions of short-term investments 25,000 120,316 164,913
Advances from joint interest partners (8,347) 12,112 5,963
Proceeds from equipment and property sales 0 0 2,202
Net cash used in investing activities (2,445,076) (1,038,605) (629,390)
Cash flows from financing activities:      
Proceeds from issuance of senior notes 1,000,000 400,000 800,000
Proceeds from revolving credit facility 600,000 0 0
Principal payments on revolving credit facility (264,430) 0 0
Debt issuance costs (22,910) (8,012) (18,680)
Proceeds from sale of common stock 314,580 0 0
Purchases of treasury stock (1,566) (3,194) (602)
Net cash provided by financing activities 1,625,674 388,794 780,718
Increase (decrease) in cash and cash equivalents (121,546) (257,425) 327,352
Beginning of period 213,447 470,872 143,520
End of period 91,901 213,447 470,872
Parent/Issuer [Member]
      
Cash flows from operating activities:      
Net income 227,959 153,388 79,390
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in earnings of subsidiaries (299,459) (202,924) (99,836)
Deferred income taxes (42,542) (29,588) (12,204)
Derivative, Gain (Loss) on Derivative, Net     0
Stock-based compensation expenses 11,602 10,219 3,656
Debt discount amortization and other 4,018 2,277 1,196
Working capital and other changes:      
Change in accounts receivable (460) (222) (88)
Increase (Decrease) in Prepaid Expense (5) (4) (73)
Change in other current assets 235 (217) (18)
Increase (Decrease) in Other Operating Assets 0 25 (100)
Change in accounts payable and accrued liabilities 20,710 18,612 17,127
Net cash provided by operating activities (77,942) (48,434) (10,950)
Cash flows from investing activities:      
Purchases of short-term investments   (126,213) (184,907)
Redemptions of short-term investments 25,000 120,316 164,913
Net cash used in investing activities 25,000 (5,897) (19,994)
Cash flows from financing activities:      
Proceeds from issuance of senior notes 1,000,000 400,000 800,000
Debt issuance costs (16,362) (7,307) (16,838)
Proceeds from sale of common stock 314,580    
Purchases of treasury stock (1,566) (3,194) (602)
Investment in / capital contributions from subsidiaries (1,343,230) (644,853) (428,074)
Net cash provided by financing activities (46,578) (255,354) 354,486
Increase (decrease) in cash and cash equivalents (99,520) (309,685) 323,542
Beginning of period 133,797 443,482 119,940
End of period 34,277 133,797 443,482
Combined Guarantor Subsidiaries [Member]
      
Cash flows from operating activities:      
Net income 299,459 202,924 99,836
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, depletion and amortization 307,055 206,734 74,981
Impairment of oil and gas properties 1,168 3,581 3,610
Gain (loss) on sale of properties     207
Deferred income taxes 177,125 122,067 58,993
Derivative, Gain (Loss) on Derivative, Net 35,432 (34,164) (1,595)
Stock-based compensation expenses 380 114  
Debt discount amortization and other 230 533 365
Working capital and other changes:      
Change in accounts receivable (110,266) (94,106) (66,134)
Increase (Decrease) in Inventories (13,941) (29,313) (2,550)
Increase (Decrease) in Prepaid Expense (8,186) 350 (1,527)
Change in other current assets (291) 373 (473)
Increase (Decrease) in Other Operating Assets (3,248) (120) (39)
Change in accounts payable and accrued liabilities 89,994 62,319 20,511
Change in other current liabilities   (472) 472
Change in other liabilities 887   317
Net cash provided by operating activities 775,798 440,820 186,974
Cash flows from investing activities:      
Payments to Explore and Develop Oil and Gas Properties (893,524) (1,051,365) (613,720)
Acquisition of oil and gas properties 1,560,072    
Derivative settlements (8,133) 6,545 (3,841)
Advances from joint interest partners (8,347) 12,112 5,963
Proceeds from equipment and property sales     2,202
Net cash used in investing activities (2,470,076) (1,032,708) (609,396)
Cash flows from financing activities:      
Proceeds from revolving credit facility 600,000    
Principal payments on revolving credit facility (264,430)    
Debt issuance costs (6,548) (705) (1,842)
Investment in / capital contributions from subsidiaries 1,343,230 644,853 428,074
Net cash provided by financing activities 1,672,252 644,148 426,232
Increase (decrease) in cash and cash equivalents (22,026) 52,260 3,810
Beginning of period 79,650 27,390 23,580
End of period 57,624 79,650 27,390
Intercompany Eliminations [Member]
      
Cash flows from operating activities:      
Net income (299,459) (202,924) (99,836)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in earnings of subsidiaries 299,459 202,924 99,836
Working capital and other changes:      
Change in accounts receivable 3,253 4,225 1,322
Change in accounts payable and accrued liabilities (3,253) (4,225) (1,322)
Net cash provided by operating activities     $ 0