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Income Tax - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Current tax provision (benefit)	$ 4,923	$ (301)	$ 13,083	$ 7,586
Deferred tax benefit	(1,621)	(4,539)	(2,734)	(6,338)
Income tax expense (benefit)	$ 3,302	$ (4,840)	$ 10,349	$ 1,248

X

- Definition

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

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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