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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 75,255		$ 75,255		$ 44,762
Income from unconsolidated joint ventures	$ 472	$ 671	$ 2,931	$ 19,143
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	50.00%		50.00%
Income from unconsolidated joint ventures	$ 558	596	$ 3,166	19,030
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	$ 23,121		$ 23,121		25,083
Income from unconsolidated joint ventures	$ (116)	(45)	$ (291)	(81)
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method paramount ownership percentage	25.00%		25.00%
Investments in unconsolidated joint ventures	$ 48,530		$ 48,530		16,031
Income from unconsolidated joint ventures		100	$ (18)	133
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	$ 3,604		$ 3,604		$ 3,648
Income from unconsolidated joint ventures	$ 30	$ 20	$ 74	$ 61