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Debt - Mortgage Debt (Details) - Mortgages - USD ($) | Sep. 30, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017
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1542 Third Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | $ 30,000,000.0
Stated rate (as a percent) | 4.29% |  |  | 4.29%
10 Bank Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  | $ 35,000,000.0 |
Stated rate (as a percent) | 4.23% |  | 4.23% |
First Stamford Place |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 180,000,000.0 |  |
Stated rate (as a percent) | 4.28% | 4.28% |  |
First Stamford Place - First Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | $ 164,000,000 | $ 164,000,000.0 |  |
Stated rate (as a percent) | 4.09% | 4.09% |  |
First Stamford Place - Second Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | $ 16,000,000 | $ 16,000,000.0 |  |
Stated rate (as a percent) | 6.25% | 6.25% |  |
1010 Third Avenue and 77 West 55th Street |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 40,000,000.0 |  |
Stated rate (as a percent) | 4.01% | 4.01% |  |
383 Main Avenue |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  | $ 30,000,000.0 |  |
Stated rate (as a percent) | 4.44% | 4.44% |  |

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