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Capital - Additional Information and Private Perpetual Preferred Units (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Aug. 31, 2021 shares | Jul. 31, 2021 shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 $ / shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 $ / shares | Dec. 31, 2020 $ / shares shares | May 16, 2019 shares
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
OP units outstanding (in shares) | 285,104,512 |  |  | 285,104,512 |  | 285,104,512 |  |  |
Conversion rate tor LTIP units to OP units | 1 |  |  | 1 |  | 1 |  |  |
Dividends on common stock received until performance criteria met for LTIP units (as a percent) | 10.00% |  |  | 10.00% |  | 10.00% |  |  |
Dividends on common stock received after performance criteria met for LTIP units (as a percent) | 90.00% |  |  | 90.00% |  | 90.00% |  |  |
Dividends on common stock received in periods after performance criteria met for LTIP units (as a percent) | 100.00% |  |  | 100.00% |  | 100.00% |  |  |
Stock repurchase authorized amount | $ | $ 500,000,000 |  |  | $ 500,000,000 |  | $ 500,000,000 |  |  |
Purchases of equity securities (shares) | 221,771 | 403,831 | 0 |  |  |  |  |  |
Dividends declared (in USD per share) | $ / shares |  |  |  | $ 0.035 | $ 0 | $ 0.070 | $ 0.210 |  |
2019 Plan |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
Number of shares authorized under the plan (in shares) | 11,000,000 |  |  | 11,000,000 |  | 11,000,000 |  |  | 11,000,000
Private perpetual preferred units, series 2019 |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
Private perpetual preferred units, issued (in shares) | 4,664,038 |  |  | 4,664,038 |  | 4,664,038 |  | 4,664,000 |
Private perpetual preferred units, liquidation preference (in USD per share) | $ / shares | $ 13.52 |  |  | $ 13.52 |  | $ 13.52 |  | $ 13.52 |
Preferred units cumulative cash distributions (in USD per share) | $ / shares | $ 0.70 |  |  | $ 0.70 |  | $ 0.70 |  |  |
Private perpetual preferred units, series 2014 |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
Private perpetual preferred units, issued (in shares) | 1,560,000 |  |  | 1,560,000 |  | 1,560,000 |  | 1,560,000 |
Private perpetual preferred units issued during period (in shares) |  |  |  |  |  | 1,560,360 |  |  |
Private perpetual preferred units, liquidation preference (in USD per share) | $ / shares | $ 16.62 |  |  | $ 16.62 |  | $ 16.62 |  | $ 16.62 |
Dividends declared (in USD per share) | $ / shares |  |  |  |  |  | $ 0.60 |  |  |
Empire state realty trust |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
OP units owned by the Company (in shares) | 173,292,301 |  |  | 173,292,301 |  | 173,292,301 |  |  |
Empire state realty trust | Empire state realty OP |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
OP units owned by the Company (as a percent) |  |  |  |  |  | 60.80% |  |  |
Other partners, certain directors, officers and other members of executive management |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
OP units not owned by the Company (in shares) | 111,812,211 |  |  | 111,812,211 |  | 111,812,211 |  |  |
Other partners, certain directors, officers and other members of executive management | Empire state realty OP |  |  |  |  |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |  |  |  |  |
OP units not owned by the Company (as a percent) |  |  |  |  |  | 39.20% |  |  |

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