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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 137,734		$ 137,734		$ 78,863
(Loss) income from unconsolidated joint ventures	$ (456)	$ 2,521	$ (1,483)	$ 2,459
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%		50.00%
(Loss) income from unconsolidated joint ventures	$ 917	2,608	$ 917	2,608
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	$ 43,897		$ 43,897
(Loss) income from unconsolidated joint ventures	$ (1,249)		$ (2,121)
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	$ 21,031		$ 21,031		22,353
(Loss) income from unconsolidated joint ventures	$ (149)	(102)	$ (298)	(175)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	30.00%		30.00%
Investments in unconsolidated joint ventures	$ 69,346		$ 69,346		52,923
(Loss) income from unconsolidated joint ventures	$ 8	(16)	$ (7)	(18)
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	$ 3,460		$ 3,460		$ 3,587
(Loss) income from unconsolidated joint ventures	$ 17	$ 31	$ 26	$ 44