Income Taxes - Schedule of Additional Information Relating to Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at the end of the year that, if recognized, would favorably affect the effective tax rate (includes interest and penalties of $13,083, $13,004 and $12,200, respectively)	$ 74,785	$ 40,353	$ 36,272
Offset to deferred tax assets for unrecognized tax benefits that, if recognized, would not affect the effective tax rate	15,578	40,875	38,833
Interest and penalties recognized in current income tax expense (after giving effect to the reversal of interest and penalties of $3,865, $3,177 and $7,326, respectively)	$ 79	$ 804	$ (2,599)