Investments in Unconsolidated Joint Ventures - Summary of Investments and Income from Investments In Unconsolidated Joint Ventures (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	May 31, 2023
Residential Development Fund's [Member]
Schedule Of Equity Method Investments [Line Items]
Proportionate share of impairment loss on for sale condominium units	$ 23,942
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Distributions made in excess of share of earnings recognized negative basis				$ 11,770	$ 13,427
Income (Loss) of investment accounted under equity method accounting				3,313
Proportionate share of income (loss) of equity method investment not recognized				$ 1,657
Equity method paramount ownership percentage	50.00%			50.00%
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Difference between carrying amount of investment and equity	$ 463			$ 463
Equity method paramount ownership percentage	44.10%			44.10%
1600 Broadway [Member]
Schedule Of Equity Method Investments [Line Items]
Difference between carrying amount of investment and equity	$ 307			$ 307
Equity method paramount ownership percentage	9.20%			9.20%
60 Wall Street [Member]
Schedule Of Equity Method Investments [Line Items]
Distributions made in excess of share of earnings recognized negative basis		$ 668		$ 1,051
Income (Loss) of investment accounted under equity method accounting	$ (7,661)
Proportionate share of income (loss) of equity method investment not recognized	$ (383)
Equity method paramount ownership percentage	5.00%			5.00%
Proportionate share of real estate impairment loss		24,734	$ 24,734
Real estate impairment loss		$ 455,893	$ 455,893
60 Wall Street [Member] | Nonrecourse [Member]
Schedule Of Equity Method Investments [Line Items]
Defaulted on non-recourse mortgage loan						$ 575,000
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Difference between carrying amount of investment and equity	$ 640			$ 640
Equity method paramount ownership percentage	35.00%			35.00%
Equity method economic interest percentage				2.60%
Impairment loss on for sale condominium units	$ 68,407
One Steuart Lane [Member] | Residential Development Fund's [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	7.40%			7.40%
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Difference between carrying amount of investment and equity	$ 4,215			$ 4,215
Equity method paramount ownership percentage	9.50%			9.50%
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Distributions made in excess of share of earnings recognized negative basis				$ 5,920	$ 107
Income (Loss) of investment accounted under equity method accounting				(11,862)
Proportionate share of income (loss) of equity method investment not recognized				$ (5,813)
Equity method paramount ownership percentage	49.00%			49.00%