Real Estate Fund Investments - Summary of the Fair Value of Property Funds and the Alternative Investment Fund Consolidated with Balance Sheet and Income from Fund Investments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2015
Investment Holdings [Line Items]
Real estate fund investments			$ 416,438
Cash and other assets, net			7,050
Total real estate fund investments			423,488
Less: noncontrolling interests in consolidated real estate funds			(396,196)
Paramount Group, Inc.'s equity in real estate fund investments			$ 27,292
Income from real estate fund investments	$ 14,072	$ 19,293
Less: amounts attributable to noncontrolling interests	(7,302)	(10,520)
Income from real estate fund investments attributable to Paramount Group, Inc.	6,770	8,773
Net investment loss [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	2,808	7,157
Net unrealized gains [Member]
Investment Holdings [Line Items]
Income from real estate fund investments	$ 11,264	$ 12,136