Subsequent Events	12 Months Ended
Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	24. Subsequent Events 2017 Out-Performance Plan On January 13, 2017, the Committee approved the 2017 Outperformance Plan, a multi-year, performance-based equity compensation plan (the “2017 OPP”). Awards under the 2017 OPP constitute awards under Vornado’s shareholder approved 2010 Omnibus Share Plan. Under the 2017 OPP, participants have the opportunity to earn compensation payable in the form of equity awards if, and only if, Vornado outperforms a predetermined total shareholder return (“TSR”) and/or outperform the market with respect to relative total TSR during a three-year performance period. Specifically, awards under our 2017 OPP may potentially be earned if Vornado (i) achieves a TSR level greater than 7% per annum, or 21% over the three-year performance period (the “Absolute Component”) and/or (ii) achieves a TSR above that of the SNL US REIT Index (the “Index”) over a three-year performance period (the “Relative Component”). To the extent awards would be earned under the Absolute Component but Vornado underperforms the Index, such awards earned under the Absolute Component would be reduced (and potentially fully negated) based on the degree to which Vornado underperforms the Index. In certain circumstances, in the event Vornado outperforms the Index but awards would not otherwise be earned under the Absolute Component, awards may still be earned under the Relative Component. Moreover, to the extent awards would otherwise be earned under the Relative Component but Vornado fails to achieve at least a 3% per annum absolute TSR level, such awards earned under the Relative Component would be reduced based on Vornado’s absolute TSR performance, with no awards being earned in the event Vornado’s TSR during the applicable measurement period is 0% or negative, irrespective of the degree to which it may outperform the Index. If the designated performance objectives are achieved, OPP Units are also subject to time-based vesting requirements; 33.33% in each of years three, four and five. Dividend payments on awards issued accrue during the performance period and are paid to participants if, and only if, awards are ultimately earned based on the achievement of the designated performance objectives. In addition, all of Vornado’s senior executive officers are required to hold any earned OPP awards (or related equity) for at least one year following vesting.

24. Subsequent Events

2017 Out-Performance Plan

On January 13, 2017, the Committee approved the 2017 Outperformance Plan, a multi-year, performance-based equity compensation plan (the “2017 OPP”). Awards under the 2017 OPP constitute awards under Vornado’s shareholder approved 2010 Omnibus Share Plan. Under the 2017 OPP, participants have the opportunity to earn compensation payable in the form of equity awards if, and only if, Vornado outperforms a predetermined total shareholder return (“TSR”) and/or outperform the market with respect to relative total TSR during a three-year performance period. Specifically, awards under our 2017 OPP may potentially be earned if Vornado (i) achieves a TSR level greater than 7% per annum, or 21% over the three-year performance period (the “Absolute Component”) and/or (ii) achieves a TSR above that of the SNL US REIT Index (the “Index”) over a three-year performance period (the “Relative Component”). To the extent awards would be earned under the Absolute Component but Vornado underperforms the Index, such awards earned under the Absolute Component would be reduced (and potentially fully negated) based on the degree to which Vornado underperforms the Index. In certain circumstances, in the event Vornado outperforms the Index but awards would not otherwise be earned under the Absolute Component, awards may still be earned under the Relative Component. Moreover, to the extent awards would otherwise be earned under the Relative Component but Vornado fails to achieve at least a 3% per annum absolute TSR level, such awards earned under the Relative Component would be reduced based on Vornado’s absolute TSR performance, with no awards being earned in the event Vornado’s TSR during the applicable measurement period is 0% or negative, irrespective of the degree to which it may outperform the Index. If the designated performance objectives are achieved, OPP Units are also subject to time-based vesting requirements; 33.33% in each of years three, four and five. Dividend payments on awards issued accrue during the performance period and are paid to participants if, and only if, awards are ultimately earned based on the achievement of the designated performance objectives. In addition, all of Vornado’s senior executive officers are required to hold any earned OPP awards (or related equity) for at least one year following vesting.