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Share-Based Compensation - Weighted-Average Assumptions Used for Grants of Stock Options and SARs (Detail) (USD $)
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Forfeiture rate 10.21% 11.50%
Risk free interest rate, minimum 0.07% 0.01%
Risk free interest rate, maximum 1.95% 3.18%
Expected weighted-average life 5 years 5 months 23 days 5 years 5 months 1 day
Fair value of stock appreciation rights (SARs) granted $ 82,910 $ 0
Weighted-average grant date fair value of SARs granted $ 15.08 $ 0.00
Stock Option and Stock Appreciation Rights (SARs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 35.90% 35.33%
Risk free interest rate 0.94% 2.01%