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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Beginning balance, unrecognized tax benefits	$ (35,826)	$ (94,915)
Gross increases - tax positions in prior period	(49,412)	(1,400)
Gross decreases - tax positions in prior period		23,896
Gross increases - current-period tax positions	(18,861)	(4,142)
Decreases relating to settlements	4,619	34,259
Reductions as a result of lapse of statute of limitations	4,531	6,497
Foreign exchange movement	(13)	(21)
Ending balance, unrecognized tax benefits	$ (94,962)	$ (35,826)

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Unrecognized tax benefits increase decreases resulting from foreign currency translation.

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Amount of unrecognized tax benefits.

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