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Schedule of Cash-Settled Stock Appreciation Rights Activity (Detail) (Cash-settled SARs, USD $)
6 Months Ended
Jun. 28, 2013
Cash-settled SARs
 
Shares  
Beginning of year 456,195
Forfeited/expired (20,667)
Ending of year 435,528
Weighted Average Exercise Price  
Weighted Average Exercise Price, Outstanding - beginning of year $ 6.67
Weighted Average Exercise Price, Forfeited/expired $ 5.58
Outstanding - end of year $ 6.72