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Discontinued Operations (Summarized Results from Discontinued Operations) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]        
Revenues $ 0 $ 4 $ 0 $ 13
Cost of oil and gas producing activities 0 (4) 0 (10)
Other operating expenses 0 1,043 0 989
Income from discontinued operations before income taxes 0 1,043 0 992
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 0 100 0 100
Income tax benefit 0 86 0 555
Income from discontinued operations, net of taxes $ 0 $ 1,229 $ 0 $ 1,647