Secured Debt, Net - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) credit_facility	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Interest expense	$ 136,619,000	$ 82,352,000	$ 237,333,000	$ 160,723,000
Covenants, minimum tangible net worth	$ 3,500,000,000		$ 3,500,000,000
Covenants, percentage of recourse indebtedness	0.05		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		$ 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		0.8333
Secured credit facilities | Line of Credit
Debt Instrument [Line Items]
New borrowings			$ 3,060,267,000		$ 7,763,563,000
Collateral	$ 19,485,553,000		$ 19,485,553,000		17,042,381,000
Number of new secured credit facilities | credit_facility			1
Maximum borrowing capacity	1,000,000,000		$ 1,000,000,000
Number of existing secured credit facilities with increased size | credit_facility			6
Additional credit capacity			$ 1,400,000,000
Remaining borrowing capacity	1,000,000,000		1,000,000,000
Borrowings	13,932,436,000		13,932,436,000		12,299,580,000
Secured credit facilities | Line of Credit | New Borrowings
Debt Instrument [Line Items]
New borrowings			3,700,000,000
Collateral	4,700,000,000		4,700,000,000
Acquisition facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	250,000,000		250,000,000
Borrowings	0		0		$ 0
Interest expense	303,000	221,000	608,000	618,000
Amortization of deferred fees and expenses	$ 81,000	$ 96,000	$ 168,000	$ 178,000