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Debt - Mortgage Debt (Details) - Mortgages - USD ($) | 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% |  |
First Stamford Place - First Lien |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 164,000,000.0 |  |
Stated rate (as a percent) | 4.09% |  |
First Stamford Place - Second Lien |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 16,000,000 |  |
Stated rate (as a percent) | 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% |  |
383 Main Avenue |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 30,000,000.0 |  |
Stated rate (as a percent) | 4.44% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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