Goodwill and Intangible Assets - Change in the Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning Balance	$ 418,547	$ 444,817
Additions from acquisition	8,729	3,646
Foreign currency translation adjustments	(19,725)	(29,916)
Ending Balance	407,551	418,547
Clear Aligner
Goodwill [Roll Forward]
Beginning Balance	112,208	112,691
Additions from acquisition	0	3,646
Foreign currency translation adjustments	(2,728)	(4,129)
Ending Balance	109,480	112,208
Systems and Services
Goodwill [Roll Forward]
Beginning Balance	306,339	332,126
Additions from acquisition	8,729	0
Foreign currency translation adjustments	(16,997)	(25,787)
Ending Balance	$ 298,071	$ 306,339