Real Estate and Other Activities - Summary of Activity in Credit Loss Reserves (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Receivables [Abstract]
Balance at beginning of the year		$ 553,297	$ 511,473
Provision for credit loss, net	[1]	14,554	65,982
Expected credit loss reserve written off or related to financial instruments sold, repaid, or satisfied	[2]	(525,079)	0
Balance at end of the period		$ 42,772	$ 577,455

[1] The amount in 2025 is primarily related to Prospect. See "Leasing Operations (Lessor)" in this Note 3 for further discussion.

[2] The amount in 2026 is primarily related to write-offs of previously reserved Prospect mortgages and other financing leases. See "Leasing Operations (Lessor)" in this Note 3 for further discussion.