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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
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 429,358		$ 449,180
Loss from unconsolidated joint ventures	$ (4,221)	$ (1,027)
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%
Market Center [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	67.00%
Investments in unconsolidated joint ventures	$ 201,952		219,593
Loss from unconsolidated joint ventures	$ (2,854)
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	44.10%
Investments in unconsolidated joint ventures	$ 94,601		95,384
Loss from unconsolidated joint ventures	$ (684)
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	49.00%
Investments in unconsolidated joint ventures	$ 40,637		41,519
Loss from unconsolidated joint ventures	$ (610)	(872)
60 Wall Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	5.00%
Investments in unconsolidated joint ventures	$ 19,155		19,777
Loss from unconsolidated joint ventures	$ (82)	(149)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	35.00%
Investments in unconsolidated joint ventures	$ 69,533		69,536
Loss from unconsolidated joint ventures	$ (1)	(15)
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	9.50%
Investments in unconsolidated joint ventures	$ 3,480		$ 3,371
Loss from unconsolidated joint ventures	$ 10	$ 9