Annual report pursuant to Section 13 and 15(d)

Stock Option and Purchase Plans - Compensation Expense Information Based on Fair Value of Stock Options (Detail)

v3.3.1.900
Stock Option and Purchase Plans - Compensation Expense Information Based on Fair Value of Stock Options (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock compensation expense $ 2,274 $ 1,730 $ 1,384
Tax benefit (177) (122) (112)
Stock compensation expense, net of tax $ 2,097 $ 1,608 $ 1,272