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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Feb. 07, 2019	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 231,983		$ 231,983			$ 78,863
(Loss) income from unconsolidated joint ventures	$ (1,332)	$ 472	$ (2,815)	$ 2,931
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	$ 373	558	$ 1,290	3,166
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	49.00%		49.00%		49.00%
Investments in unconsolidated joint ventures	$ 42,625		$ 42,625
(Loss) income from unconsolidated joint ventures	$ (1,266)		$ (3,387)
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	$ 95,874		$ 95,874
(Loss) income from unconsolidated joint ventures	$ (336)		$ (336)
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	$ 20,425		$ 20,425			22,353
(Loss) income from unconsolidated joint ventures	$ (138)	(116)	$ (436)	(291)
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	$ 69,545		$ 69,545			52,923
(Loss) income from unconsolidated joint ventures	$ 1		$ (6)	(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	$ 3,514		$ 3,514			$ 3,587
(Loss) income from unconsolidated joint ventures	$ 34	$ 30	$ 60	$ 74