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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Weighted-average risk-free interest rate     1.73%
Dividend yield 0.00% 0.00% 0.00%
Weighted-average expected volatility     38.32%
Total weighted-average expected forfeiture rate     0.00%
Weighted-average expected life (years)     5 years 1 month 9 days
Total weighted-average remaining vesting period in years 1 year 6 months 10 days 2 years 3 months 3 years 9 months 3 days
Total fair value of options granted for continuing operations     $ 1,853,000
Stock-based compensation expense - Cost of sales for continuing operations $ 317,000 $ 321,000 303,000
Stock-based compensation expense - SG&A for continuing operations 108,000 836,000 1,410,000
Income tax benefit for continuing operations $ (164,000) $ (444,000) $ (662,000)