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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	18.80%	17.10%
Accrued interest on unrecognized tax benefits	$ 543		$ 568
Gross unrecognized tax benefits excluding interest and penalties	40,725		$ 32,684
Net unrecognized tax benefits excluding interest and penalties	33,085
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions	$ 1,452

X

- Definition

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

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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