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Deferred Revenue and Customer Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Revenue Arrangement        
Extended warranty $ 46,753 $ 46,499 $ 43,300 $ 34,909
Equipment maintenance and training 39,037 30,616    
Customer advances, undelivered elements and other 22,151 34,157    
Total deferred revenue and customer advances $ 107,941 $ 111,272