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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Examination [Line Items]
Effective tax rates	13.80%	15.90%	17.60%	9.50%
Discrete tax benefit recorded	$ (6,837)	$ (8,757)	$ (25,801)	$ (16,339)
Change in Accounting Method Accounted for as Change in Estimate [Member]
Income Tax Examination [Line Items]
Discrete tax benefit recorded				$ 10,500

X

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to 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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