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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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 11, 2019	Feb. 07, 2019
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 449,180	$ 78,863
(Loss) income from unconsolidated joint ventures	$ (4,706)	3,468	$ 20,185
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%
(Loss) income from unconsolidated joint ventures	$ 1,849	3,901	20,072
Market Center [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	67.00%			67.00%
Investments in unconsolidated joint ventures	$ 219,593
(Loss) income from unconsolidated joint ventures	$ (744)
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	44.10%
Investments in unconsolidated joint ventures	$ 95,384
(Loss) income from unconsolidated joint ventures	$ (826)
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	$ 41,519
(Loss) income from unconsolidated joint ventures	$ (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	$ 19,777	22,353
(Loss) income from unconsolidated joint ventures	$ (551)	(518)	(152)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	35.00%
Investments in unconsolidated joint ventures	$ 69,536	52,923
(Loss) income from unconsolidated joint ventures	$ (118)	(18)	182
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	9.50%
Investments in unconsolidated joint ventures	$ 3,371	3,587
(Loss) income from unconsolidated joint ventures	$ 78	$ 103	$ 83