Variable Interest Entities ("VIEs") - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Real estate, net		$ 6,996,618		$ 7,099,669
Cash and cash equivalents and restricted cash		465,324		331,487		$ 365,409	$ 250,425
Deferred rent receivable		330,239		301,588
Deferred charges, net		116,278		126,367
Intangible assets, net		153,519		203,169
Other assets		48,976		51,373
Total assets		8,554,097	[1]	8,734,135	[1]	$ 8,755,978
Notes and mortgages payable, net		3,800,739		3,783,851
Accounts payable and accrued expenses		101,901		117,356
Intangible liabilities, net		55,996		73,789
Other liabilities		62,931		66,004
Total liabilities	[1]	4,038,363		4,103,173
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		3,470,766		1,685,391
Cash and cash equivalents and restricted cash		134,647		69,828
Investments in unconsolidated joint ventures		67,505		69,535
Accounts and other receivables		6,871		2,140
Deferred rent receivable		192,401		57,338
Deferred charges, net		55,156		24,030
Intangible assets, net		76,545		29,872
Other assets		21,496		21,132
Total assets		4,025,387		1,959,266
Notes and mortgages payable, net		2,457,272		1,205,324
Accounts payable and accrued expenses		51,590		35,252
Intangible liabilities, net		33,566		19,841
Other liabilities		4,486		13,047
Total liabilities		$ 2,546,914		$ 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 91.3% as of December 31, 2020. The assets and liabilities of the Operating Partnership, as of December 31, 2020, include $4,025,387 and $2,546,914 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 11, Variable Interest Entities (“VIEs”).