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Financial Guarantee Liability - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
loan
Guarantor Obligations      
Outstanding loan balances $ 24,600,000   $ 24,000,000
Maximum loss potential 7,400,000   7,200,000
Portion covered by Credit Enhancement Agreement     6,200
Provision for expected credit losses (1,648) $ 17,900 11,631
Delinquent      
Guarantor Obligations      
Outstanding loan balances 22,800   53,500
Maximum loss potential $ 7,600   $ 17,800
Number of loans (loans) | loan 1   4
Liquidation value of loans outstanding $ 18,800   $ 39,000
Potential loss on liquidation of loan $ 1,400   $ 5,300
Fannie Mae DUS or Freddie TAH Loans | Maximum      
Guarantor Obligations      
Percentage of contingent liability of actual losses incurred on outstanding loans (in percentage) 33.00%