Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	(0.50%)	(1.70%)	4.50%
NOLs recognized upon change in tax law			(2.90%)
Foreign, state and local tax, net of Federal benefit	1.90%	3.60%	3.70%
Nondeductible expenses	1.80%	1.40%	1.60%
Stock option compensation	(0.10%)	(0.50%)
Research and development credits	(0.50%)	(2.30%)	(5.30%)
Effect of different tax rates of foreign jurisdictions	(10.00%)	(10.80%)	(10.50%)
Other tax exempt income	(0.90%)		(0.50%)
Other	(0.10%)	0.30%	1.00%
Effective rate	25.60%	24.00%	25.60%