Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Weighted-average risk-free interest rate	1.83%
Dividend yield	0.00%	0.00%	0.00%
Weighted-average expected volatility	45.18%
Total weighted-average expected forfeiture rate	7.88%
Weighted-average expected life (years)	5 years 10 months 24 days	0 years	0 years
Total weighted-average remaining vesting period in years	5 years 9 months 29 days	2 years 5 months 12 days	3 years 4 months 17 days
Total fair value of options granted	$ 7,262,000
Stock-based compensation expense-Cost of sales	255,000	227,000	278,000
Stock-based compensation expense-SG&A	1,660,000	1,315,000	1,374,000
Income tax benefit	$ (747,000)	$ (601,000)	$ (603,000)