Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.50%	1.50%	1.50%
Domestic manufacturing deduction	(0.80%)	(1.10%)	(1.00%)
Research and development tax credit	(3.10%)	(1.10%)	(2.20%)
Valuation allowance for foreign subsidiaries net operating losses	0.20%	0.00%	0.30%
Other permanent differences	0.80%	0.80%	0.10%
Effective income tax rate for continuing operations	33.60%	35.10%	33.70%