Investments in Unconsolidated Joint Ventures - Summary of Investments and Income from Investments In Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 412,724	$ 449,180
(Loss) income from unconsolidated joint ventures	$ (18,619)	(4,706)	$ 3,468
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%
(Loss) income from unconsolidated joint ventures	$ 687	1,849	3,901
Market Center [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	67.00%
Investments in unconsolidated joint ventures	$ 192,306	219,593
(Loss) income from unconsolidated joint ventures	$ (11,315)	(744)
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	44.10%
Investments in unconsolidated joint ventures	$ 92,298	95,384
(Loss) income from unconsolidated joint ventures	$ (2,723)	(826)
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	49.00%
Investments in unconsolidated joint ventures	$ 37,818	41,519
(Loss) income from unconsolidated joint ventures	$ (3,172)	(4,394)
60 Wall Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	5.00%
Investments in unconsolidated joint ventures	$ 19,164	19,777
(Loss) income from unconsolidated joint ventures	$ (70)	(551)	(518)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	35.00%
Investments in unconsolidated joint ventures	$ 67,505	69,536
(Loss) income from unconsolidated joint ventures	$ (2,043)	(118)	(18)
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	9.50%
Investments in unconsolidated joint ventures	$ 3,633	3,371
(Loss) income from unconsolidated joint ventures	$ 17	$ 78	$ 103

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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