Summary of Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	2 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 12, 2016	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2017	Dec. 31, 2015
Provisions for Income Taxes [Line Items]
Income tax benefit				$ 4,900
Predecessor [Member]
Provisions for Income Taxes [Line Items]
Federal			$ 0		$ (660)
State			0		1
Current income tax expense (benefit), total			0		(659)
Federal			0		(261)
State			0		(4,451)
Deferred income tax benefit, total			0		(4,712)
Income tax benefit			$ 0		$ (5,371)
Successor [Member]
Provisions for Income Taxes [Line Items]
Federal		$ 0		0
State		0		0
Current income tax expense (benefit), total	$ 0			0
Federal		0		(4,943)
State		0		0
Deferred income tax benefit, total		0		(4,943)
Income tax benefit		$ 0		$ (4,943)