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Consolidating Financial Statements - Schedule of Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 |  |  |

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- Definition The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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