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Discontinued Operations (Assets and Liabilities of Discontinued Operations) (Detail) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets of Discontinued Operations: |  |
Receivables, net of allowance for bad debt | $ 6 | $ 4,632
Oil and gas properties and equipment, net | 0 | 79,733
Goodwill and other intangible assets | 0 | 19,673
Prepaid expenses | 8 | 96
Other assets | 0 | 833
Assets | 14 | 104,967
Liabilities of Discontinued Operations: |  |
Accounts payable | 67 | 342
Accrued property taxes | 0 | 259
Other accrued expenses | 5,228 | 8,924
Other liabilities | 0 | 1,667
Liabiltiies | $ 5,295 | $ 11,192

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