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Deferred Revenue and Customer Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Revenue Arrangement        
Extended warranty $ 46,499 $ 43,300 $ 34,909 $ 28,044
Equipment maintenance and training 30,616 30,500    
Customer advances 17,456 8,875    
Undelivered elements and other 16,701 8,857    
Total deferred revenue and customer advances $ 111,272 $ 91,532