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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Amount of investment in equity method investee and investment in and advance to affiliate.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 136,426		$ 78,863
Loss from unconsolidated joint ventures	$ (1,027)	$ (62)
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	49.00%
Investments in unconsolidated joint ventures	$ 45,152
Loss from unconsolidated joint ventures	$ (872)
60 Wall Street [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	5.00%
Investments in unconsolidated joint ventures	$ 21,685		22,353
Loss from unconsolidated joint ventures	$ (149)	(73)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	30.00%
Investments in unconsolidated joint ventures	$ 66,059		52,923
Loss from unconsolidated joint ventures	$ (15)	(2)
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	9.50%
Investments in unconsolidated joint ventures	$ 3,530		$ 3,587
Loss from unconsolidated joint ventures	$ 9	$ 13