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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Cash flows from operating activities: |  |
Net income | $ 169,953 | $ 51,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Depreciation, depletion and amortization | 91,272 | 66,261
Gain on sale of properties | (183,393) | 0
Impairment of oil and gas properties | 762 | 498
Deferred income taxes | 98,753 | 30,987
Derivative instruments | 17,603 | 14,612
Stock-based compensation expenses | 4,505 | 2,289
Debt discount amortization and other | 1,487 | 746
Working capital and other changes: |  |
Change in accounts receivable | (9,275) | (3,360)
Change in inventory | 790 | (8,407)
Change in prepaid expenses | (14,259) | 293
Change in other current assets | (29) | (232)
Change in other assets | (1,593) | 0
Change in accounts payable and accrued liabilities | 29,007 | 15,009
Change in other current liabilities | 2,766 | 0
Change in other liabilities | (82) | 0
Net cash provided by operating activities | 208,267 | 170,547
Cash flows from investing activities: |  |
Capital expenditures | (280,895) | (217,819)
Proceeds from sale of properties | 321,943 | 0
Costs related to sale of properties | (2,010) | 0
Derivative settlements | (2,239) | 1,686
Advances from joint interest partners | (1,898) | (1,691)
Net cash provided by (used in) investing activities | 34,901 | (217,824)
Cash flows from financing activities: |  |
Principal payments on revolving credit facility | (275,570) | 0
Purchases of treasury stock | (3,025) | (156)
Debt issuance costs | 0 | (25)
Other | (176) | 0
Net cash used in financing activities | (278,771) | (181)
Decrease in cash and cash equivalents | (35,603) | (47,458)
Beginning of period | 91,901 | 213,447
End of period | 56,298 | 165,989
Parent/Issuer [Member] |  |
Cash flows from operating activities: |  |
Net income | 169,953 | 51,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Equity in earnings of subsidiaries | (196,933) | (66,243)
Deferred income taxes | (16,053) | (8,626)
Stock-based compensation expenses | 4,428 | 2,278
Debt discount amortization and other | 1,123 | 644
Working capital and other changes: |  |
Change in accounts receivable | 0 | 11
Change in prepaid expenses | 159 | 157
Change in other current assets | 0 | (339)
Change in accounts payable and accrued liabilities | (19,307) | (8,286)
Net cash provided by operating activities | (56,630) | (28,553)
Cash flows from investing activities: |  |
Net cash provided by (used in) investing activities | 0 |
Cash flows from financing activities: |  |
Purchases of treasury stock | (3,025) | (156)
Investment in / capital contributions from affiliates | 26,490 | (23,252)
Other | (176) |
Net cash used in financing activities | 23,289 | (23,408)
Decrease in cash and cash equivalents | (33,341) | (51,961)
Beginning of period | 34,277 | 133,797
End of period | 936 | 81,836
Combined Guarantor Subsidiaries [Member] |  |
Cash flows from operating activities: |  |
Net income | 196,933 | 66,243
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Depreciation, depletion and amortization | 91,272 | 66,261
Gain on sale of properties | (183,393) |
Impairment of oil and gas properties | 762 | 498
Deferred income taxes | 114,806 | 39,613
Derivative instruments | 17,603 | 14,612
Stock-based compensation expenses | 77 | 11
Debt discount amortization and other | 364 | 102
Working capital and other changes: |  |
Change in accounts receivable | (12,977) | (3,740)
Change in inventory | 790 | (8,407)
Change in prepaid expenses | (14,418) | 136
Change in other current assets | (29) | 107
Change in other assets | (1,593) |
Change in accounts payable and accrued liabilities | 52,016 | 23,664
Change in other current liabilities | 2,766 |
Change in other liabilities | (82) |
Net cash provided by operating activities | 264,897 | 199,100
Cash flows from investing activities: |  |
Capital expenditures | (280,895) | (217,819)
Proceeds from sale of properties | 321,943 |
Costs related to sale of properties | (2,010) |
Derivative settlements | (2,239) | 1,686
Advances from joint interest partners | (1,898) | (1,691)
Net cash provided by (used in) investing activities | 34,901 | (217,824)
Cash flows from financing activities: |  |
Principal payments on revolving credit facility | (275,570) |
Debt issuance costs |  | (25)
Investment in / capital contributions from affiliates | (26,490) | 23,252
Net cash used in financing activities | (302,060) | 23,227
Decrease in cash and cash equivalents | (2,262) | 4,503
Beginning of period | 57,624 | 79,650
End of period | 55,362 | 84,153
Intercompany Eliminations [Member] |  |
Cash flows from operating activities: |  |
Net income | (196,933) | (66,243)
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Equity in earnings of subsidiaries | 196,933 | 66,243
Working capital and other changes: |  |
Change in accounts receivable | 3,702 | 369
Change in accounts payable and accrued liabilities | $ (3,702) | $ (369)

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- Definition The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References No definition available. + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas). + References Reference 1: 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 2: 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=31042434&loc=d3e3213-108585 + 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=31042434&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 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 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 + 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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