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Supplemental Oil and Gas Reserve Information - Changes in Standardized Measure of Discounted Future Net Cash Flows Applicable to Proved Oil and Natural Gas Reserves (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Standardized Measure of Discounted Future Net Cash Flows |  |  |
January 1, | $ 2,259,897 | $ 1,319,471 | $ 485,735
Net changes in prices and production costs | 254,979 | (7,814) | 299,108
Net changes in future development costs | 57,566 | 28,124 | (38,244)
Sales of oil and natural gas, net | (857,540) | (542,515) | (262,485)
Purchases of reserves in place | 858,382 | 15,890 | 2,679
Sales of reserves in place |  |  | (2,499)
Revisions of previous quantity estimates | 99,954 | (47,957) | (5,058)
Previously estimated development costs incurred | 373,912 | 480,925 | 146,847
Accretion of discount | 346,068 | 190,370 | 69,782
Net change in income taxes | (774,910) | (400,196) | (372,146)
Changes in timing and other | (1,951) | (134,880) | 6,055
December 31, | 3,727,559 | 2,259,897 | 1,319,471
Extensions [Member] |  |  |
Standardized Measure of Discounted Future Net Cash Flows |  |  |
Proved oil and gas reserves increase | $ 1,111,202 | $ 1,358,479 | $ 989,697

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 + Details
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