- Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.40%	1.50%	1.50%
Domestic manufacturing deduction	(2.10%)	(0.80%)	(1.10%)
Research and development tax credit	(4.30%)	(3.10%)	(1.10%)
Valuation allowance for foreign subsidiaries net operating losses	0.00%	0.20%	0.00%
Non-deductible expenses	2.40%	0.40%	0.30%
Other permanent differences	(0.40%)	0.40%	0.50%
Effective income tax rate for continuing operations	32.00%	33.60%	35.10%