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Agreements and Transactions with Related Parties (Details 2) shares in Millions	1 Months Ended						3 Months Ended							6 Months Ended		12 Months Ended
	Apr. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Aug. 31, 2014 USD ($) item	Jul. 31, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2015 USD ($) shares	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($) item	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)	Mar. 31, 2012 USD ($)	Jun. 30, 2015 USD ($) item shares	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Agreements and transactions with related parties
Due from related party							$ 2,499,584							$ 2,499,584		$ 36,515
Due to related party							1,991,665							1,991,665		$ 2,653,333
Interest income recorded							100,000			$ 900,000				200,000	$ 1,700,000
Income from equity affiliates							1,534,025			40,493				$ 4,629,938	80,541
Interest rate (as a percent)														5.65%		5.45%
Investments in equity affiliates							24,368,379							$ 24,368,379		$ 4,869,066
Legal, financial and accounting fees																	$ 1,400,000
Additional preferred equity investment outstanding							$ 1,595,706,784							$ 1,595,706,784		$ 1,587,429,498
Minimum
Agreements and transactions with related parties
Ownership interest allowed under company charter (as a percent)							5.00%							5.00%
Residential Mortgage Banking Company
Agreements and transactions with related parties
Indirect ownership percentage														22.50%
Income from equity affiliates							$ 1,500,000							$ 4,500,000
Mezzanine Loans
Agreements and transactions with related parties
Interest rate (as a percent)														9.44%		9.78%
Additional preferred equity investment outstanding							61,952,792							$ 61,952,792		$ 76,392,650
Preferred equity investments
Agreements and transactions with related parties
Interest rate (as a percent)														6.86%		6.11%
Additional preferred equity investment outstanding							93,270,827							$ 93,270,827		$ 133,505,658
Bridge Loans
Agreements and transactions with related parties
Interest rate (as a percent)														5.51%		5.19%
Additional preferred equity investment outstanding							1,346,226,583							$ 1,346,226,583		$ 1,273,439,238
Bridge Loans | First mortgage
Agreements and transactions with related parties
Additional preferred equity investment outstanding								$ 116,000,000
Maturity date of March 2016 | Bridge Loans
Agreements and transactions with related parties
Interest income recorded							1,200,000			1,200,000				$ 2,400,000	1,400,000
Loan to third party borrower, unpaid principal balance					$ 70,100,000
Interest rate (as a percent)														6.38%
ACM
Agreements and transactions with related parties
Due from related party							2,500,000							$ 2,500,000
Due to related party							$ 2,000,000							2,000,000		2,700,000
Management fees to be remitted														$ 700,000
Number of shares held by related party | shares							5.3							5.3
Percentage of voting power held by related party							10.00%							10.00%
ACM | Maximum
Agreements and transactions with related parties
Due from related party																100,000
ACM | Residential Mortgage Banking Company
Agreements and transactions with related parties
Noncontrolling interest in equity method investment acquired (as a percent)								50.00%
Acquisition purchase price								$ 9,600,000
ACM | Non-qualified Residential Mortgages | Residential Mortgage Banking Company
Agreements and transactions with related parties
Equity investment made														$ 5,300,000
ACM | Maturity date of March 2016 | Bridge Loans
Agreements and transactions with related parties
Amount of bridge loan purchased from related party					$ 15,000,000
Interest rate (as a percent)														7.20%
ACM | Maturity date of June 2014
Agreements and transactions with related parties
Interest income recorded							$ 200,000			$ 200,000				$ 400,000	$ 600,000
Number of mortgage loans secured by property purchased from related party | item														2
Amount of mortgage loan secured by property purchased from related party														$ 22,400,000
Payment of debt											$ 2,300,000
ACM | Maturity date of March 2015 | First mortgage
Agreements and transactions with related parties
Amount of mortgage loan secured by property purchased from related party														$ 14,600,000
Original variable rate basis														LIBOR
Original basis spread (as a percent)										4.80%					4.80%
ACM | Maturity date of April 2015 | Second mortgage
Agreements and transactions with related parties
Amount of mortgage loan secured by property purchased from related party														$ 5,100,000
Original variable rate basis														LIBOR
Original basis spread (as a percent)							4.80%							4.80%
Mr. Ivan Kaufman | Maturity date of February 2018 | Preferred equity investments
Agreements and transactions with related parties
Loan amount retained by related party		$ 23,000,000														$ 18,000,000
Fixed rate of interest (as a percent)		10.00%
Interest income recorded							$ 600,000							$ 1,100,000
Amount of ownership interest of related party in the entity		$ 2,000,000
Mr. Ivan Kaufman | Maturity date of January 2016 | Bridge Loans
Agreements and transactions with related parties
Interest income recorded														1,400,000
Mr. Ivan Kaufman. | Maturity date of August 2015 | Bridge Loans
Agreements and transactions with related parties
Interest income recorded							100,000							$ 100,000
Investments in equity affiliates									$ 100,000
Ownership interest (as a percent)									5.00%
Number of properties owned | item									2
Percentage of ownership interest of related party in the entity									95.00%
Number of bridge loans originated | item			2
Amount of mortgage loan secured by property purchased from related party			$ 5,000,000
Base spread (as a percent)			5.50%
Base rate			one-month LIBOR
Mr. Ivan Kaufman. | Maturity date of January 2016 | Bridge Loans
Agreements and transactions with related parties
Interest income recorded							$ 700,000
Percentage of ownership interest of related party in the entity				24.00%
Amount of mortgage loan secured by property purchased from related party				$ 30,400,000
Base spread (as a percent)				7.90%
Base rate				LIBOR
Kaufman Entities | ACM
Agreements and transactions with related parties
Percentage of outstanding membership interest of related party in another related party							92.00%							92.00%
Lexford Portfolio
Agreements and transactions with related parties
Aggregate outstanding balance of related party debt							$ 806,100,000							$ 806,100,000
Lexford Portfolio | Preferred equity investments
Agreements and transactions with related parties
Noncontrolling interest														44,000
Payment of debt														8,000,000
Loan restructured						$ 67,600,000
Additional preferred equity investment outstanding						25,000,000
Interest held in the additional investment made						10,500,000
Additional investment made by the company along with a consortium of independent outside investors												$ 22,500,000
Equity investment made														$ 100,000
Equity investment, balance						0
Lexford Portfolio | Preferred equity investments | Mr. Fred Weber
Agreements and transactions with related parties
Interest held in the additional investment made						$ 500,000
Lexford Portfolio | Original preferred equity investment
Agreements and transactions with related parties
Fixed rate of interest (as a percent)														2.36%
Original variable rate basis						LIBOR
Original basis spread (as a percent)						5.00%
Modified variable rate basis														LIBOR
Modified basis spread (as a percent)							1.65%							1.65%
Lexford Portfolio | New preferred equity investment
Agreements and transactions with related parties
Fixed rate of interest (as a percent)														12.00%
Affiliate of Mr. Ivan Kaufman
Agreements and transactions with related parties
Ownership interest (as a percent)							53.90%							53.90%
Contract period with the new entity														7 years 6 months
Fees as a percentage of gross revenues of the underlying properties														4.75%
Affiliate of Mr. Ivan Kaufman | Mr. Fred Weber
Agreements and transactions with related parties
Noncontrolling interest													$ 250,000
Ownership interest (as a percent)							23.50%							23.50%
Certain officers and manager | Maturity date of April 2018 | Bridge Loans
Agreements and transactions with related parties
Interest income recorded	$ 100,000
Percentage of ownership interest of related party in the entity	90.00%
Amount of mortgage loan secured by property purchased from related party	$ 6,300,000
Base spread (as a percent)	4.50%
Interest rate, floor	0.25%

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