Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	34.00%	34.00%	34.00%
Increase (Decrease) resulting from:
U.S. Taxes on foreign income, net of taxes paid credit	1.00%	0.30%	(1.70%)
Change in valuation allowance	(1.90%)	(0.80%)
Foreign, state and local tax, net of Federal benefit	1.60%	1.90%	3.60%
Nondeductible expenses	1.80%	1.80%	1.40%
Stock option compensation	(0.10%)	(0.10%)	(0.50%)
Research and development credits	(0.90%)	(0.50%)	(2.30%)
Effect of different tax rates of foreign jurisdictions	(12.10%)	(10.00%)	(10.80%)
Undistributed profits of subsidiaries	2.40%
Other tax exempt income	(0.10%)	(0.90%)
Other	0.30%	(0.10%)	0.30%
Effective rate	26.00%	25.60%	24.00%