Schedule IV - Changes in Mortgage Loans Excluding Allowance for Credit Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]
Balance at beginning of year	$ 364,420	$ 213,320	$ 248,335
New mortgage loans and additional advances on existing loans	155,223	177,924	1,128,695
Exchange rate fluctuations	31,530	(15,824)	(3,640)
Mortgage loans on real estate including additions during year	551,173	375,420	1,373,390
Collection of principal	(241,072)	(11,000)	(1,160,070)
Deductions during year	(241,072)	(11,000)	(1,160,070)
Balance at end of year	$ 310,101	$ 364,420	$ 213,320