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Deferred Revenue and Customer Advances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jul. 01, 2018
Apr. 01, 2018
Jan. 01, 2018
Deferred Revenue Arrangement            
Maintenance and training $ 60,331   $ 58,362      
Extended warranty 28,716 $ 27,242 27,422 $ 25,971 $ 24,590 $ 24,438
Customer advances, undelivered performance obligations and other 38,155   24,677      
Total deferred revenue and customer advances $ 127,202   $ 110,461