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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Significant Accounting Policies [Line Items]      
Products sold that qualify for commission time period 12 months    
Advertising expense $ 102,962,000 $ 52,480,000 $ 27,661,000
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]   Operating Expenses Operating Expenses
Government assistance, amount $ 0 $ 463,000 $ 2,265,000
Buildings      
Significant Accounting Policies [Line Items]      
Intangible assets useful life 50 years    
Restricted Stock Units (RSUs) | Tranche One      
Significant Accounting Policies [Line Items]      
Award vesting period 1 year    
Employee Stock Option      
Significant Accounting Policies [Line Items]      
Award vesting period 6 years    
Minimum      
Significant Accounting Policies [Line Items]      
Loan receivable, average repayment period 7 months    
Amortization period 3 years    
Intangible assets useful life 3 years    
Minimum | Restricted Stock Units (RSUs)      
Significant Accounting Policies [Line Items]      
Award vesting period 3 years    
Minimum | Restricted Stock Units (RSUs) | Tranche One      
Significant Accounting Policies [Line Items]      
Share-based payment award, vesting percentage 25.00%    
Minimum | Restricted Stock Units (RSUs) | Tranche Two      
Significant Accounting Policies [Line Items]      
Award vesting period 3 years    
Maximum      
Significant Accounting Policies [Line Items]      
Loan receivable, average repayment period 10 months    
Amortization period 5 years    
Intangible assets useful life 10 years    
Maximum | Restricted Stock Units (RSUs)      
Significant Accounting Policies [Line Items]      
Award vesting period 4 years    
Maximum | Restricted Stock Units (RSUs) | Tranche One      
Significant Accounting Policies [Line Items]      
Award vesting period 1 year    
Share-based payment award, vesting percentage 33.00%    
Maximum | Restricted Stock Units (RSUs) | Tranche Two      
Significant Accounting Policies [Line Items]      
Award vesting period 4 years    
Product Concentration Risk | Revenue, Product and Service | Commissions and Service Fees      
Significant Accounting Policies [Line Items]      
Concentration risk, percentage 85.00% 83.00% 77.00%
Product Concentration Risk | Revenue, Product and Service | Incentive Fees      
Significant Accounting Policies [Line Items]      
Concentration risk, percentage 7.00% 9.00% 13.00%
Product Concentration Risk | Revenue, Product and Service | Advertising Revenue      
Significant Accounting Policies [Line Items]      
Concentration risk, percentage 3.00% 3.00% 4.00%
Product Concentration Risk | Revenue, Product and Service | Destination services      
Significant Accounting Policies [Line Items]      
Concentration risk, percentage 3.00% 3.00% 3.00%
Product Concentration Risk | Revenue, Product and Service | PrePayModel Customer      
Significant Accounting Policies [Line Items]      
Concentration risk, percentage 86.00% 84.00% 78.00%