Income Taxes - Schedule of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal		$ (21)	$ (58)	$ (91)
State		3,424	3,242	1,689
International		(135)	16	(49)
Current provision (benefit) for income taxes		3,268	3,200	1,549
Deferred
Federal		7,821	(71,742)	0
State		1,411	(15,220)	0
International		(3,470)	16	(17)
Deferred provision (benefit) for income taxes		5,762	(86,946)	(17)
Income tax expense (benefit)	$ 4,000	$ 9,030	$ (83,746)	$ 1,532

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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