Secured Credit Agreements and Mortgage Loan Payable - Additional Information (Details) $ in Millions			6 Months Ended	12 Months Ended
	Jun. 08, 2021	Jun. 07, 2021 USD ($)	Jun. 30, 2021 USD ($) CreditFacility	Dec. 31, 2020 CreditFacility	Jun. 16, 2021 shares
Debt Instrument [Line Items]
Covenant minimum tangible net worth		$ 1,000.0
Covenants minimum percentage of tangible assets on cash proceeds from equity issuances	75.00%	75.00%
Debt to equity covenant equity adjustment product of total indebtedness multiplication percentage		25.00%
Debt-to-equity test ratio		4.25
Debt instrument liquidity covenant		$ 15.0
Percentage of minimum interest coverage ratio		5.00%
Minimum interest coverage ratio		1.5
Mortgages
Debt Instrument [Line Items]
Mortgage loan payable			$ 50.0
Mortgage loan, description			The first mortgage loan was provided by an institutional lender, has an initial maturity date of December 15, 2021, and includes an option to extend the maturity for 12 months subject to the satisfaction of customary extension conditions, including (i) the purchase of a new interest rate cap for the extension term, (ii) replenishment of the interest reserve with an amount equal to 12 months of debt service, (iii) payment of a 0.25% extension fee on the outstanding principal balance, and (iv) no event of default. The first mortgage loan permits partial releases of collateral in exchange for payment of a minimum release price equal to the greater of 100% of net sales proceeds (after reasonable transaction expenses) or 115% of the allocated loan amount. The loan bears interest at a rate of LIBOR plus 4.50% subject to a LIBOR interest rate floor of 0.50% and a rate cap of 0.50%.
Initial maturity date			Dec. 15, 2021
Percentage of extension fee on outstanding principal balance			0.25%
Percentage of net sales proceeds			100.00%
Percentage of allocated loan amount			115.00%
Posted cash to pre-fund interest payments			$ 2.4
Remaining reserve balance			$ 1.4
Mortgages | LIBOR
Debt Instrument [Line Items]
Line of credit, spread on variable rate			4.50%
Series B Preferred Stock
Debt Instrument [Line Items]
Covenant maximum debt equity ratio			3.0
Redeemed outstanding shares | shares					9,000,000
Interest Rate Floor | Mortgages | LIBOR
Debt Instrument [Line Items]
Line of credit, spread on variable rate			0.50%
Rate Cap | Mortgages
Debt Instrument [Line Items]
Line of credit, spread on variable rate			0.50%
Secured Credit Facilities
Debt Instrument [Line Items]
Number of secured credit facilities | CreditFacility			7	7
Secured Credit Facilities | Holdco
Debt Instrument [Line Items]
Recourse guarantee percentage			25.00%	25.00%
Secured Credit Facilities | Commercial Mortgage Loans
Debt Instrument [Line Items]
Number of secured credit facilities | CreditFacility			49	55