Real Estate Fund Investments - Summary of the Fair Value of Property Funds and the Alternative Investment Fund Consolidated with Balance Sheet and Income from Fund Investments (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2015

Dec. 31, 2015

Investment Holdings [Line Items]

Real estate fund investments

$ 416,438

Cash and other assets, net

7,050

Total real estate fund investments

423,488

Less: noncontrolling interests in consolidated real estate funds

(396,196)

Paramount Group, Inc.'s equity in real estate fund investments

$ 27,292

Income (loss) from real estate fund investments

$ 10,933

$ 30,226

Less: amounts attributable to noncontrolling interests

(8,763)

(19,283)

Income from real estate fund investments attributable to Paramount Group, Inc.

2,170

10,943

Net investment income (loss) [Member]

Investment Holdings [Line Items]

Income (loss) from real estate fund investments

3,206

10,363

Net realized gains [Member]

Investment Holdings [Line Items]

Income (loss) from real estate fund investments

11,955

Previously recorded unrealized gain on exited investments [Member]

Investment Holdings [Line Items]

Income (loss) from real estate fund investments

(6,790)

(6,058)

Net unrealized gains [Member]

Investment Holdings [Line Items]

Income (loss) from real estate fund investments

$ 2,562

$ 13,966