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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