ALLOWANCE FOR CREDIT LOSSES (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Accrued investment income receivable	$ 11,100			$ 11,100	$ 10,000
Write off of interest receivable				95	217
Effective yield interest receivables	9,590			9,590	12,195
Interest income related to loans on non-accrual status				11,900
Additional reserve through provision for credit losses				76,720	34,151
Other Investment Receivables [Member]
Write off of interest receivable				95
Additional reserve through provision for credit losses				38,032	24,769
Other Investment Note Due 2024 Through 2025 [Member] | Agemo Holdings LLC [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Additional reserve through provision for credit losses		$ 16,700	$ 22,700
Accrued Interest Reserved Through Credit Loss [Member] | Guardian [Member] | Mortgage Note Due 2027 [Member]
Additional reserve through provision for credit losses	$ 1,000			$ 1,000
Accrued Interest Reserved Through Credit Loss [Member] | Agemo Holdings LLC [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Additional reserve through provision for credit losses			$ 3,800		$ 3,800