Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred Revenue Disclosure [Abstract]
Maintenance, service and training	$ 66,458	$ 78,089
Customer advances, undelivered elements and other	35,731	59,147
Extended warranty	34,897	56,180	$ 64,168	$ 51,929
Total deferred revenue and customer advances	$ 137,086	$ 193,416