Variable Interest Entities ("VIEs") - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Real estate, net		$ 7,015,456	$ 7,099,669
Cash and cash equivalents and restricted cash		546,907	331,487	$ 323,438	$ 365,409
Deferred rent receivable		326,050	301,588
Deferred charges, net		120,211	126,367
Intangible assets, net		167,675	203,169
Other assets		80,660	51,373
Total assets	[1]	8,806,494	8,734,135
Notes and mortgages payable, net		3,798,944	3,783,851
Accounts payable and accrued expenses		109,228	117,356
Intangible liabilities, net		61,485	73,789
Other liabilities		59,531	66,004
Total liabilities	[1]	4,253,361	4,103,173
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		3,474,281	1,685,391
Cash and cash equivalents and restricted cash		120,883	69,828
Investments in unconsolidated joint ventures		67,769	69,535
Accounts and other receivables		3,852	2,140
Deferred rent receivable		183,890	57,338
Deferred charges, net		56,647	24,030
Intangible assets, net		81,066	29,872
Other assets		33,954	21,132
Total assets		4,022,342	1,959,266
Notes and mortgages payable, net		2,456,764	1,205,324
Accounts payable and accrued expenses		51,383	35,252
Intangible liabilities, net		33,733	19,841
Other liabilities		4,398	13,047
Total liabilities		$ 2,546,278	$ 1,273,464

[1] Represents the consolidated assets and liabilities of Paramount Group Operating Partnership LP, a Delaware limited partnership (the “Operating Partnership”). The Operating Partnership is a consolidated variable interest entity (“VIE”), of which we are the sole general partner and own approximately 91.4% as of September 30, 2020. The assets and liabilities of the Operating Partnership, as of September 30, 2020, include $4,022,342 and $2,546,278 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 12, Variable Interest Entities (“VIEs”).