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Other Assets and Liabilities - Summary of Components of Other Assets (Parenthetical) (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Schedule Of Other Assets [Line Items]    
Percentage of yield in subordinate risk retention interest 10.00%  
2018 Single Asset Securitization [Member]    
Schedule Of Other Assets [Line Items]    
Single asset securitization principal amount $ 857.3 $ 930.0
Single asset securitization maximum maturity date Jun. 09, 2025