Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Deferred Revenue Arrangement
Extended warranty	$ 33,949	$ 34,909	$ 29,547	$ 28,042
Equipment maintenance and training	24,650	22,455
Customer advances	9,940	4,825
Undelivered elements	5,477	6,971
Acceptance	4,776
Total deferred revenue and customer advances	$ 78,792	$ 69,160