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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 421,183		$ 421,183		$ 449,180
Loss from unconsolidated joint ventures	$ (5,955)	$ (456)	$ (10,176)	$ (1,483)
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%		50.00%
Loss from unconsolidated joint ventures	$ 229	917	$ 229	917
Market Center [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	67.00%		67.00%
Investments in unconsolidated joint ventures	$ 197,250		$ 197,250		219,593
Loss from unconsolidated joint ventures	$ (3,070)		$ (5,924)
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	$ 93,939		$ 93,939		95,384
Loss from unconsolidated joint ventures	$ (662)		$ (1,346)
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	$ 39,417		$ 39,417		41,519
Loss from unconsolidated joint ventures	$ (919)	(1,249)	$ (1,529)	(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	$ 19,148		$ 19,148		19,777
Loss from unconsolidated joint ventures	$ (9)	(149)	$ (91)	(298)
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	$ 67,986		$ 67,986		69,536
Loss from unconsolidated joint ventures	$ (1,549)	8	$ (1,550)	(7)
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	$ 3,443		$ 3,443		$ 3,371
Loss from unconsolidated joint ventures	$ 25	$ 17	$ 35	$ 26