Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2023	Jan. 31, 2023	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Senior notes			$ 3,741,161		$ 1,249,141
Description of variable rate basis		SOFR
Asset-backed notes			516,668
Short-term borrowings			6,730,663		3,554,951
Long-term borrowings			7,123,426		3,964,537
FHLB Advances			4,956		$ 5,183
Subsequent Event [Member]
Debt Instrument [Line Items]
Description of variable rate basis	SOFR
Equipment Finance Loan [Member]
Debt Instrument [Line Items]
Asset-backed notes				$ 550,000
Weighted average interest rate				5.84%
5.053% Fixed Rate Senior Notes Due to Mature in January 2034 [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,000,000
Senior notes maturity date		Jan. 31, 2034
Interest rate of debt instrument		5.05%
Variable interest rate of debt instrument		1.85%
4.65% Fixed Rate Senior Notes Due to Mature in January 2026 [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,300,000
Senior notes maturity date		Jan. 31, 2026
Interest rate of debt instrument		4.65%
4.70% Fixed Rate Senior Notes Due to Mature in January 2028 [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,200,000
Senior notes maturity date		Jan. 31, 2028
Interest rate of debt instrument		4.70%
7.41% Fixed Rate Senior Notes Due to Mature in October 2029 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Senior notes	$ 750,000
Senior notes maturity date	Jan. 31, 2034
Interest rate of debt instrument	7.41%
Variable interest rate of debt instrument	2.80%
FHLB of New York [Member]
Debt Instrument [Line Items]
Available line of credit			14,300,000
FRB of New York [Member]
Debt Instrument [Line Items]
Available line of credit			$ 15,800,000