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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Parenthetical) (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total fair value of options granted   $ 1,853,000 $ 5,518,000
Stock-based compensation expense - Cost of sales $ 321,000 303,000 139,000
Stock-based compensation expense - SG&A 836,000 1,410,000 636,000
Income tax benefit $ (444,000) (662,000) (302,000)
Discontinued Operations [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total fair value of options granted   62,000 1,744,000
Stock-based compensation expense - Cost of sales   126,000 116,000
Stock-based compensation expense - SG&A   508,000 1,024,000
Income tax benefit   $ (244,000) $ (445,000)