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)

v3.6.0.2
Stock Option and Purchase Plans - Compensation Expense Information Based on Fair Value of Stock Options (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock Compensation Expense $ 2,281 $ 2,274 $ 1,730
Tax Benefit (145) (177) (122)
Stock Compensation Expense, Net of Tax $ 2,136 $ 2,097 $ 1,608