Secured Debt, Net - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) lender	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Interest expense	$ 343,730,000	$ 317,197,000
Covenants, minimum tangible net worth	$ 3,600,000,000
Covenants, percentage of recourse indebtedness	0.05
Minimum
Debt Instrument [Line Items]
Covenants, EBITDA to fixed charges, in percent	1.4
Covenants, percentage of tangible assets on cash proceeds from equity issuances	0.75
Covenants, minimum cash liquidity amount	$ 10,000,000.0
Maximum
Debt Instrument [Line Items]
Covenants, percentage of tangible assets on cash proceeds from equity issuances	0.85
Covenants, indebtedness to total assets, in percent	0.8333
Secured credit facilities | Line of Credit
Debt Instrument [Line Items]
New borrowings	$ 407,616,000		$ 112,078,000
Collateral	$ 18,132,466,000		18,594,318,000
Number of lenders | lender	15
Remaining borrowing capacity	$ 1,200,000,000
Borrowings	12,403,449,000		12,697,058,000
Secured credit facilities | Line of Credit | New Borrowings
Debt Instrument [Line Items]
New borrowings	407,600,000
Collateral	545,900,000
Acquisition facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	100,000,000
Borrowings	0		0
Interest expense	122,000		722,000
Amortization of deferred fees and expenses	$ 33,000		$ 233,000