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Deferred Revenue and Customer Advances (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2014
Jun. 29, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Dec. 31, 2012
Deferred Revenue Arrangement            
Extended warranty $ 43,497 $ 40,052 $ 34,909 $ 36,320 $ 34,854 $ 26,987
Equipment maintenance and training 27,703   22,455      
Customer advances 5,041   4,825      
Undelivered elements 7,185   6,971      
Total deferred revenue and customer advances $ 83,426   $ 69,160