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Supplementary Information - Standardized Measure of Discounted Future Net Cash Flows and Changes therein Relating to Proved Oil and Gas Reserves (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |
Sales of oil and gas produced, net of production costs | $ (48,976) | $ (48,673)
Net changes in prices and production costs | (10,149) | 504
Extensions, discoveries and improved recovery | 218,648 | 164,557
Revisions of previous quantity estimates | (733) | 40,964
Net change in development costs | (129,672) | (145,382)
Reserves sold |  |
Reserves purchased |  | 6,563
Accretion of discount | 21,327 | 18,451
Net change in income taxes | (23,007) | (5,952)
Changes in production rates (timing) and other | (2,483) | (2,267)
Net change | 24,955 | 28,765
Standardized measure of discounted future net cash flow: |  |
Beginning of year | 213,273 | 184,508
End of year | $ 238,228 | $ 213,273

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time. + 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 (h) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 + Details
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