Income Taxes - Summary of Reconciliation Net Income Attributable to Estimated Taxable Income (Loss) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net (loss) income attributable to Paramount Group, Inc.	$ 57,308	$ 8,905	$ 1,116	$ (4,709)	$ (9,731)	$ (4,419)
Book to tax differences:
Straight-line and prepaid rents	6,927					(36,131)
Depreciation and amortization	11,691					104,399
Stock based compensation	57,740					5,794
Gain on consolidation of unconsolidated joint venture	(192,891)
Swap breakage costs	(11,316)					(27,147)
Unrealized gain on interest rate swaps	(6,832)					(29,586)
Earnings of unconsolidated joint ventures, including real estate investments	(5,347)					(12,909)
Other, net	20,832					7,356
Estimated taxable income (loss) (unaudited)	$ (61,888)					$ 7,357