Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
(Loss) income from continuing operations before income taxes	$ (6,490)	$ (13,778)	$ (162,992)	$ 53,182
Income tax benefit (provision)	$ 765	$ 1,637	$ (640)	$ (5,918)
Effective tax rate	11.80%	11.90%	(0.40%)	11.10%