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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 417,592		$ 417,592		$ 449,180
Loss from unconsolidated joint ventures	$ (4,268)	$ (1,332)	$ (14,444)	$ (2,815)
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%		50.00%
Loss from unconsolidated joint ventures	$ 229	373	$ 458	1,290
Market Center [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	67.00%		67.00%
Investments in unconsolidated joint ventures	$ 195,419		$ 195,419		219,593
Loss from unconsolidated joint ventures	$ (2,654)		$ (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	$ 93,225		$ 93,225		95,384
Loss from unconsolidated joint ventures	$ (713)	(336)	$ (2,059)	(336)
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	$ 38,550		$ 38,550		41,519
Loss from unconsolidated joint ventures	$ (884)	(1,266)	$ (2,413)	(3,387)
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	$ 19,154		$ 19,154		19,777
Loss from unconsolidated joint ventures	$ 10	(138)	$ (81)	(436)
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	$ 67,769		$ 67,769		69,536
Loss from unconsolidated joint ventures	$ (223)	1	$ (1,773)	(6)
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	$ 3,475		$ 3,475		$ 3,371
Loss from unconsolidated joint ventures	$ (33)	$ 34	$ 2	$ 60