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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

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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