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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Weighted-average risk-free interest rate   1.73% 1.83%
Dividend yield 0.00% 0.00% 0.00%
Weighted-average expected volatility   38.32% 45.18%
Total weighted-average expected forfeiture rate   0.00% 7.88%
Weighted-average expected life (years)   5 years 1 month 10 days 5 years 10 months 24 days
Total weighted-average remaining vesting period in years 2 years 3 months 3 years 9 months 4 days 3 years 9 months 7 days
Total fair value of options granted for continuing operations   $ 1,853,000 $ 5,518,000
Stock-based compensation expense - Cost of sales for continuing operations $ 321,000 303,000 139,000
Stock-based compensation expense - SG&A for continuing operations 836,000 1,410,000 636,000
Income tax benefit for continuing operations $ (444,000) $ (662,000) $ (302,000)