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Discontinued Operations (Additional Information) (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) a well | Dec. 31, 2015 USD ($) a well | Dec. 31, 2014 USD ($) a well
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
(Loss) gain on disposition of proved property | $ (13,664) | $ (706) | $ 8,526
Net mineral acres leased from others sold | a | 199,263 |  |
Gross producing oil and gas wells sold | well | 379 |  |
Net producing oil and gas wells sold | well | 95 |  |
Proceeds from sale of oil and gas property and equipment | $ 80,374 | 17,800 | 17,660
Reimbursement of capital costs related to sale of in progress wells | 3,269 |  |
Non-cash impairment charges | 60,939 | $ 108,184 | $ 15,934
Pending Litigation | Huffman vs. Forestar Petroleum Corporation |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Accrual for damages | 2,990 |  |
Wyoming |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Environmental liability | 1,155 |  |
Transaction |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gas and oil area, undeveloped, net | a |  | 109,000 | 650
Productive oil wells, number of wells, gross | well |  | 39 | 124
Productive oil wells, number of wells, net | well |  | 7 | 18
Cost of Sales |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Non-cash impairment charges | $ 612 | $ 163,029 | $ 32,665

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