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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Weighted-average risk-free interest rate     1.21%
Dividend yield         
Weighted-average expected volatility     48.59%
Total weighted-average expected forfeiture rate     2.97%
Weighted-average expected life (years)     5 years 10 months 24 days
Total weighted-average remaining vesting period in years 2 years 5 months 12 days 3 years 4 months 17 days 4 years 3 months 18 days
Total fair value of options granted     $ 4,064,000
Stock-based compensation expense-Cost of sales 227,000 278,000 60,000
Stock-based compensation expense-SG&A 1,315,000 1,374,000 1,039,000
Income tax benefit $ (601,000) $ (603,000) $ (390,000)