Income Taxes - (Provision) Benefit for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CURRENT:
Federal										$ (1,107)	$ (1,788)	$ (763)
State										(2,375)	(1,291)	(1,229)
Total current provision										(3,482)	(3,079)	(1,992)
DEFERRED:
Federal										32,308	321	8,866
State										18,299	(642)	(248)
Effect of federal tax law change	$ 5,200	$ 2,000								2,030		5,229
Total deferred (provision) benefit										52,637	(321)	13,847
Total (provision) benefit for income taxes		$ 51,177	$ (530)	$ (899)	$ (593)	$ (1,048)	$ (1,822)	$ (1,415)	$ 885	$ 49,155	$ (3,400)	$ 11,855