Income Taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal income tax provision at statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	0.30%	0.20%	0.50%
Foreign income tax rate differential	(8.60%)	(5.00%)	(5.00%)
Change in statutory tax rates		(2.20%)	(0.60%)
Tax credits	(1.90%)	(2.00%)	(4.40%)
Change in unrecognized tax benefits, net	(2.10%)	1.30%	(22.70%)
Permanent differences on non-U.S. earnings	(4.40%)	(2.80%)	(0.40%)
Valuation allowance	0.40%	(2.70%)
Other	(0.90%)	(1.00%)	0.60%
Provision for income taxes	17.80%	20.80%	3.00%