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Supplemental Information on Oil and Gas Producing Activities - Changes in Standardized Measure of Discounted Future Net Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Changes in Standardized Measure of Discounted Future Net Cash Flows: |  |  |
Balance at Beginning of Period | $ 152,902 | $ 166,187 | $ 124,824
Sales of oil and gas, net of production costs | (132,662) | (168,563) | (183,705)
Net changes in prices and production costs | (52,056) | (11,223) | 194,633
Revisions of previous quantity estimates | 43,815 | 155,111 | 75,713
Additions | 29,620 | 69,092 | 7,742
Changes in estimated future development costs | (5,345) | (67,834) | (5,831)
Development costs incurred during the period | 44,389 | 34,944 | 31,913
Accretion of discount | 15,290 | 16,619 | 12,482
Net change of income taxes | 26,120 | 7,445 | 4,455
Change in production rates (timing) and other | 15,363 | (48,876) | (96,039)
Balance at End of Period | $ 137,436 | $ 152,902 | $ 166,187

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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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- 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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- Definition Amount of (increase) decrease in standardized measure of discounted future net cash flow as a result of sales and transfers of oil and gas produced. + 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 (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 + Details
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