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Investments in Equity Affiliates (Details 2) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  |  |  | 3 Months Ended | 1 Months Ended |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 item | Sep. 30, 2013 | Dec. 31, 2013 item | Sep. 30, 2014 Bridge Loans item | Dec. 31, 2013 Bridge Loans item | Sep. 30, 2014 Mezzanine Loans item | Dec. 31, 2013 Mezzanine Loans item | Sep. 30, 2014 West Shore Cafe | Dec. 31, 2013 West Shore Cafe | Jul. 31, 2014 450 West 33rd Street | Sep. 30, 2014 450 West 33rd Street | Dec. 31, 2007 450 West 33rd Street | Sep. 30, 2014 East River item | Sep. 30, 2014 East River Mr. Ivan Kaufman | Aug. 31, 2014 East River Bridge Loans item | Jul. 31, 2014 930 Flushing & 80 Evergreen | May 31, 2014 930 Flushing & 80 Evergreen | Sep. 30, 2014 930 Flushing & 80 Evergreen item | Dec. 31, 2013 930 Flushing & 80 Evergreen | Sep. 30, 2014 930 Flushing & 80 Evergreen Bridge Loans | Sep. 30, 2014 930 Flushing & 80 Evergreen Mezzanine Loans
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans |  |  | 143 |  | 144 | 98 | 95 | 22 | 27 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Loans and investments, gross | $ 1,655,918,364 |  | $ 1,655,918,364 |  | $ 1,660,195,301 | $ 1,213,584,295 | $ 1,171,783,914 | $ 90,762,106 | $ 118,550,172 |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |
Number of properties owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  | 2 |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |
Variable interest rate, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.5% over one-month LIBOR |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |
Ownership interest retained |  |  |  |  |  |  |  |  |  |  |  |  | 1.44% |  |  |  |  |  |  |  |  |  |
Property air rights retained |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 29.00% |  | 5.00% |  |  |  |  | 12.50% |  |  |
Investments in equity affiliates | 5,022,502 |  | 5,022,502 |  | 4,680,306 |  |  |  |  | 1,690,280 | 1,690,280 |  | 331,788 |  | 102,607 |  |  |  |  |  | 92,199 |  |
Deferred revenue |  |  |  |  | 77,123,133 |  |  |  |  |  |  |  |  | 77,100,000 |  |  |  |  |  |  |  |  |
Amount of new debt guaranteed |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,300,000 |  |  |  |  |  |  |  |  |
Deferred gain |  |  |  |  |  |  |  |  |  |  |  | 77,100,000 |  |  |  |  |  |  |  |  |  |  |
Prepaid incentive fees |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 |  |  |  |  |  |  |  |  |  |  |
Net gain resulting from the recognition of the deferred gain as well as a prepaid incentive fee |  |  |  |  |  |  |  |  |  |  |  | 58,100,000 |  |  |  |  |  |  |  |  |  |  |
Unpaid Principal Balance of Loans to Equity Affiliates | 102,876,176 |  | 102,876,176 |  |  |  |  |  |  | 1,687,500 |  |  |  |  | 4,994,166 |  |  |  |  |  |  | 22,400,000 | 500,000
Proceeds from sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |
Income from equity affiliates | (51,170) | (81,723) | 29,371 | (245,412) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,900,000 |  |  |  |  |

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- Definition Represents the amount of gain (loss) resulting from the recognition of the deferred gain and prepaid incentive fee upon termination of portion of the guaranteed debt. + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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