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	1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Real estate fund investments			$ 416,438
Cash and other assets and liabilities, 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 (loss) from real estate fund investments	$ 1,412	$ (498)	37,975
Less: interest expense	(325)
Less: amounts attributable to noncontrolling interests	(485)		(24,896)
Income from real estate fund investments attributable to Paramount Group, Inc.	602		13,079
Net investment income (loss) [Member]
Investment Holdings [Line Items]
Income (loss) from real estate fund investments	2,769	(324)	12,274
Net realized gains [Member]
Investment Holdings [Line Items]
Income (loss) from real estate fund investments	50		13,884
Previously Recorded Unrealized Gains Losses on Exited Investments [Member]
Investment Holdings [Line Items]
Income (loss) from real estate fund investments			(6,584)
Net unrealized gains (losses) [Member]
Investment Holdings [Line Items]
Income (loss) from real estate fund investments	$ (1,407)	$ (1,706)	$ 18,401