Securitized Debt Obligations, Net - Schedule of Information on Securitized Debt Obligations Footnotes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Credit spread adjustment	0.11%
Interest expense on securitized debt obligations	$ 46.0	$ 43.1
Collateral assets | 2017 Single Asset Securitization
Debt Instrument [Line Items]
Total loan amount, securitized		$ 500.0
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
30 day average compounded SOFR reference rate	0.05%
LIBOR
Debt Instrument [Line Items]
One-month USD LIBOR	0.10%