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Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and dividends |  |  |  |  |  |  |  |  | $ 4,100,000 | $ 972,000 | $ 908,000
Mark-to-market gain (loss) |  |  |  |  |  |  |  |  | 4,200,000 | 3,100,000 | (5,900,000)
Impairment on natural gas and oil properties | $ 0 | $ 63,679,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 43,040,000 | 63,679,000 | 43,040,000 | 590,174,000
Oklahoma and Texas Panhandle |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  |  |  | $ 63,700,000 |  |
Western Oklahoma |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  |  |  |  | $ 43,000,000 |
Northwest Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  |  |  |  |  | 195,600,000
Northern Oklahoma |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  |  |  |  |  | 306,600,000
Texas Panhandle |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  |  |  |  |  | 86,900,000
Gulf Coast |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  |  |  |  |  | $ 1,100,000

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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