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Pre-tax Compensation Expense and Excess Tax Benefit Recognized in Earnings (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Pre-tax compensation expense $ 209 $ 110 $ 332
Excess tax benefit $ 174 $ 8 $ 5