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Stock-Based Compensation - Cash Proceeds and Intrinsic Value Related to Total Stock Options Exercised (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Statement Of Partners Capital [Abstract]    
Proceeds from stock options exercised $ 868 $ 131
Intrinsic value of stock options exercised $ 581 $ 179