REAL ESTATE, NET - Additional Information (Details) - USD ($)		1 Months Ended		12 Months Ended
	Nov. 23, 2019	Apr. 30, 2020	May 31, 2018	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Real Estate [Line Items]
Depreciation				$ 4,000,000.0	$ 3,900,000		$ 4,100,000
Finite-Lived Intangible Assets, Net				11,100,000	11,100,000
Accumulated amortization				2,700,000	1,900,000
Amortization of Intangible Assets				740,000	740,000		740,000
Aggregate fees paid by SCA to the Company				46,100,000
Remaining fees to be paid by SCA to the Company				450,000
Repayments of Debt	$ 10,600,000
Gross sales price of real estate	19,600,000
Gain on sale of real estate	$ (9,500,000)			0	$ 0	[1]	$ 9,521,000	[1]
Gain on sale of school condominium		$ 20,000,000.0
Gain on sale of school condominium, recognition of deferred construction supervision fee		$ 4,200,000
SCA [Member]
Real Estate [Line Items]
Contract Receivable				41,500,000
Construction Supervision Fee receivable				5,000,000.0
Construction Costs Reimbursed				$ 50,600,000
237 11th Property
Real Estate [Line Items]
Purchase price of property			$ 81,200,000
Business Acquisition, Transaction Costs			$ 700,000
Percentage of property leased				97.10%

[1] Amounts are revised. See Note 3 for more information.