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Stock-based Compensation Plans - Additional Information 1 (Detail) - USD ($) | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Market-based TSR |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 9,700,000 | $ 9,100,000
Market-based TSR awards for 2014-2016 performance period |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Actual performance payout adjustment | 89,000 |
Percentage of performance period grants adjusted for actual payout | 40.00% |
Performance Based Unit Production Growth Per Share And Reserve Growth Per Share |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 124,000 |

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options adjustment for actual performance stated as a percentage. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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