Variable Interest Entities ("VIEs") - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Real estate, net		$ 7,465,255	$ 7,841,530
Cash and restricted cash		30,902	31,044	$ 32,320	$ 29,374
Preferred equity investments, net		35,983	35,817
Accounts and other receivables, net		16,205	17,082
Deferred rent receivable		254,002	220,826
Deferred charges, net		111,870	98,645
Intangible assets, net		287,222	352,206
Other assets		90,143	20,076
Total assets	[1]	8,941,237	8,917,661
Notes and mortgages payable, net		3,599,800	3,583,100
Accounts payable and accrued expenses		133,995	117,630
Intangible liabilities, net		102,279	130,028
Other liabilities		56,968	54,109
Total liabilities	[1]	3,911,825	3,895,577
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		1,704,019	1,726,800
Cash and restricted cash		78,563	55,658
Investments in unconsolidated joint ventures		48,530	16,031
Preferred equity investments, net		35,983	35,817
Accounts and other receivables, net		1,571	2,550
Deferred rent receivable		50,053	44,000
Deferred charges, net		12,945	8,123
Intangible assets, net		50,822	66,112
Other assets		17,255	929
Total assets		1,999,741	1,956,020
Notes and mortgages payable, net		1,197,385	1,196,607
Accounts payable and accrued expenses		29,237	21,211
Intangible liabilities, net		35,124	46,365
Other liabilities		5	155
Total liabilities		$ 1,261,751	$ 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 90.5% as of September 30, 2018. The assets and liabilities of the Operating Partnership, as of September 30, 2018, include $1,999,741 and $1,261,751 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 14, Variable Interest Entities (“VIEs”).