Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Loss from continuing operations before income taxes	$ (6,045)	$ (24,862)
Income tax provision	$ (1,932)	$ (299)
Effective tax rate	(32.00%)	(1.20%)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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