Summary of Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income taxes (benefit)
Federal	$ 0	$ 0	$ (660)	$ 2,045
State	0	0	1	1,504
Current income tax expense (benefit), total	0	0	(659)	3,549
Deferred income tax benefit
Federal	0	0	(261)	(130,693)
State	0	0	(4,451)	(4,534)
Deferred income tax benefit, total	0	0	(4,712)	(135,227)
Income tax benefit	$ 0	$ 0	$ (5,371)	$ (131,678)