Variable Interest Entities ("VIEs") - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Real estate, net		$ 7,457,012		$ 7,841,530
Cash and restricted cash		25,756		31,044		$ 29,374	$ 41,823
Preferred equity investments, net		36,042		35,817
Accounts and other receivables, net		20,076		17,082
Deferred rent receivable		267,456		220,826
Deferred charges, net		117,858		98,645
Intangible assets, net		270,445		352,206
Other assets		109,805		20,076
Total assets		8,755,978	[1]	8,917,661	[1]	$ 8,867,168
Notes and mortgages payable, net		3,599,800		3,583,100
Accounts payable and accrued expenses		124,334		117,630
Intangible liabilities, net		95,991		130,028
Other liabilities		51,170		54,109
Total liabilities	[1]	3,864,314		3,895,577
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		1,699,618		1,726,800
Cash and restricted cash		63,450		55,658
Investments in unconsolidated joint ventures		52,923		16,031
Preferred equity investments, net		36,042		35,817
Accounts and other receivables, net		2,107		2,550
Deferred rent receivable		51,926		44,000
Deferred charges, net		14,160		8,123
Intangible assets, net		45,818		66,112
Other assets		16,635		929
Total assets		1,982,679		1,956,020
Notes and mortgages payable, net		1,197,644		1,196,607
Accounts payable and accrued expenses		24,183		21,211
Intangible liabilities, net		31,582		46,365
Other liabilities		5		155
Total liabilities		$ 1,253,414		$ 1,264,338

[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 90.3% as of December 31, 2018. The assets and liabilities of the Operating Partnership, as of December 31, 2018, include $1,982,679 and $1,253,414 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 14, Variable Interest Entities (“VIEs”).