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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]      
Provision for (benefit from) income taxes $ (1,396,939) $ 112,347 $ 57,723
Term of leases (up to) 10 years    
Number of operating segments | segment 2    
Foreign currency net gains (losses) $ 6,800 (2,000) (5,600)
Revenue remaining performance obligation 873,400    
Costs to obtain contracts 22,800 15,100  
Amortization of costs to obtain contracts 10,100 7,200 5,400
Advertising cost $ 161,000 $ 119,100 $ 88,400
Intraoral Scanners      
Significant Accounting Policies [Line Items]      
Warranty period 1 year    
CAD/CAM Software      
Significant Accounting Policies [Line Items]      
Warranty period 1 year    
Invisalign | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01      
Significant Accounting Policies [Line Items]      
Expected timing (up to two years for Invisalign Go) 6 months    
Invisalign | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01      
Significant Accounting Policies [Line Items]      
Expected timing (up to two years for Invisalign Go) 5 years    
Invisalign Go | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01      
Significant Accounting Policies [Line Items]      
Expected timing (up to two years for Invisalign Go) 2 years    
Systems and Services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01      
Significant Accounting Policies [Line Items]      
Expected timing (up to two years for Invisalign Go) 1 year    
Systems and Services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01      
Significant Accounting Policies [Line Items]      
Expected timing (up to two years for Invisalign Go) 5 years    
Revision of Prior Period, Adjustment      
Significant Accounting Policies [Line Items]      
Provision for (benefit from) income taxes $ (12,700)    
Minimum      
Significant Accounting Policies [Line Items]      
Estimated useful lives of intangibles 1 year    
Maximum      
Significant Accounting Policies [Line Items]      
Estimated useful lives of intangibles 15 years