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Stock Incentive Plans - Summary of Stock-Based Compensation Expense Related to Stock Option and Restricted Stock Unit Awards (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Stock-based compensation expense included in selling, general and administrative expenses $ 2,386 $ 1,699 $ 1,016
Deferred income taxes 948 675 404
Stock-based compensation expense related to stock options and restricted stock units, net of tax $ 1,438 $ 1,024 $ 612