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Oil and Gas Reserves Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Extractive Industries [Abstract] |  |  |
Standardized Measure, Beginning of Year | $ 372,139 | $ 1,090,660 | $ 807,217
Net change in sales price, net of production costs | (45,379) | (751,774) | 5,911
Development costs incurred during the year which were previously estimated | 45,648 | 157,390 | 344,590
Revisions of quantity estimates | 113,583 | (111,454) | (40,993)
Accretion of discount | 37,251 | 114,427 | 105,400
Changes in future development and abandonment costs | 5,315 | 14,901 | (10,909)
Changes in timing and other | (38,071) | (44,439) | (19,028)
Extensions and discoveries | 70,149 | 56,216 | 163,559
Sales of minerals in place | (22,449) | (43,694) | 0
Sales, net of production costs | (107,253) | (163,336) | (458,254)
Net changes in income taxes | (1,658) | 53,242 | 193,167
Standardized Measure, End of Year | $ 429,275 | $ 372,139 | $ 1,090,660

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- Definition Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place. + 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 (e) -URI http://asc.fasb.org/extlink&oid=68064819&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 extensions, discoveries and improved recovery of 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 (d) -URI http://asc.fasb.org/extlink&oid=68064819&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=68064819&loc=d3e62500-109447 + Details
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