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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle          
Guaranty liabilities $ 27,933   $ 29,581   $ 15
Provision for expected credit losses (1,648) $ 17,900 11,631    
Total stockholders’ equity 689,246   655,049    
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle          
Guaranty liabilities       $ 17,900 17,935
Accounts Receivable          
New Accounting Pronouncements or Change in Accounting Principle          
Allowance for doubtful accounts 13,400   13,400   11,800
Accounts Receivable | Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle          
Increase in reserve     4,200    
Loans Receivable          
New Accounting Pronouncements or Change in Accounting Principle          
Allowance for credit loss $ 3,700   $ 3,700    
Loans Receivable | Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle          
Total stockholders’ equity         $ 3,700