Schedule IV - Changes in Mortgage Loans Excluding Allowance for Credit Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]
Balance at beginning of year	$ 213,320	$ 248,335	$ 1,274,995
New mortgage loans and additional advances on existing loans	177,924	1,128,695	193,590
Exchange rate fluctuations	(15,824)	(3,640)	9,785
Mortgage loans on real estate including additions during year	375,420	1,373,390	1,478,370
Collection of principal	(11,000)	(1,160,070)	(1,230,035)
Deductions during year	(11,000)	(1,160,070)	(1,230,035)
Balance at end of year	$ 364,420	$ 213,320	$ 248,335