Income Taxes - Schedule of Income Tax Provision (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Income Tax [Line Items]
Foreign, Current	$ 105,873	$ 98,964	[1]	$ 109,729
Total deferred income tax provision	$ 14,350	$ 13,043		$ 23,350

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