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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 6 years 6 months 11 days 5 years 9 months 29 days 2 years 5 months 12 days
Total fair value of options granted $ 1,915,000 $ 7,262,000  
Stock-based compensation expense - Cost of sales 428,000 255,000 $ 227,000
Stock-based compensation expense - SG&A 1,918,000 1,660,000 1,315,000
Income tax benefit $ (906,000) $ (747,000) $ (601,000)