Annual report pursuant to Section 13 and 15(d)

Income Taxes - Effective Tax Rates Differ from Statutory Federal Income Tax (Detail)

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Income Taxes - Effective Tax Rates Differ from Statutory Federal Income Tax (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Statutory Federal income tax rate 35.00% 35.00% 35.00%
Non-deductible stock compensation expense 0.60% 0.60% 1.00%
Domestic production activity deduction (2.90%) (2.60%) (3.00%)
Non-deductible acquisition costs 0.00% 0.00% 1.00%
Other 0.20% 0.10% 0.00%
Foreign tax benefits (1.10%) (1.70%) (0.30%)
State income tax (benefits), net of Federal income tax effect 0.90% 2.60% (0.10%)
Research and development tax credits (2.70%) (4.30%) (5.00%)
Other (1.20%) (0.70%) 0.00%
Effective tax rate 28.80% 29.00% 28.60%