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Investments in Unconsolidated Joint Ventures - Summary of Investments and Income from Investments In Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 405,391		$ 405,391		$ 412,724
Income (loss) from unconsolidated joint ventures	$ 223	$ (4,268)	$ (20,810)	$ (14,444)
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%		50.00%
Income (loss) from unconsolidated joint ventures	$ 431	229	$ (10,697)	458
Market Center [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	67.00%		67.00%
Investments in unconsolidated joint ventures	$ 186,301		$ 186,301		192,306
Income (loss) from unconsolidated joint ventures	$ (2,228)	(2,654)	$ (9,272)	(8,578)
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	44.10%		44.10%
Investments in unconsolidated joint ventures	$ 89,576		$ 89,576		92,298
Income (loss) from unconsolidated joint ventures	$ (702)	(713)	$ (2,171)	(2,059)
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	49.00%		49.00%
Investments in unconsolidated joint ventures	$ 35,956		$ 35,956		37,818
Income (loss) from unconsolidated joint ventures	$ (685)	(884)	$ (1,874)	(2,413)
60 Wall Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	5.00%		5.00%
Investments in unconsolidated joint ventures	$ 19,216		$ 19,216		19,164
Income (loss) from unconsolidated joint ventures	$ 18	10	$ 52	(81)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	35.00%		35.00%
Investments in unconsolidated joint ventures	$ 70,656		$ 70,656		67,505
Income (loss) from unconsolidated joint ventures	$ 3,363	(223)	$ 3,138	(1,773)
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	9.50%		9.50%
Investments in unconsolidated joint ventures	$ 3,686		$ 3,686		$ 3,633
Income (loss) from unconsolidated joint ventures	$ 26	$ (33)	$ 14	$ 2