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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Significant Accounting Policies [Line Items]      
Revenue $ 259,444 $ 362,252  
ASU 2019-12      
Significant Accounting Policies [Line Items]      
Change in accounting principle, accounting standards update, adopted [true false] true    
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2021    
Change in accounting principle, accounting standards update, immaterial effect [true false] true    
Other Assets | On Deck Capital Incorporation      
Significant Accounting Policies [Line Items]      
Carrying value of investment $ 11,400   $ 10,500
Other Assets | Linear      
Significant Accounting Policies [Line Items]      
Carrying value of investment $ 6,800    
Minimum      
Significant Accounting Policies [Line Items]      
Days for delinquent loans to be charged off 60 days    
Delinquent loans expiry period (in days) 1 day    
Maximum      
Significant Accounting Policies [Line Items]      
Days for delinquent loans to be charged off 65 days    
Delinquent loans expiry period (in days) 64 days    
U.K. Business      
Significant Accounting Policies [Line Items]      
Agreement, scheduled expiration date July 8, 2021    
Options to extend term 3 months    
Revenue $ 700 1,900  
Administrative fee due $ 1,200 1,000 $ 900
Discontinued Operations      
Significant Accounting Policies [Line Items]      
Impairment charges   400  
Impairment charges, net of tax   $ 300