Real Estate Properties (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the beginning of the period			$ 635,612,000
Additions			27,950,000
Capitalized Costs and Improvements			35,307,000
Sales and other reductions			(6,828,000)
Depreciation and Amortization			(9,267,000)
Balance at the end of the period	682,774,000		682,774,000
Property acquisition costs	0	292,000	295,000	1,528,000
Apartment Building [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the beginning of the period			511,866,000
Additions			27,950,000
Capitalized Costs and Improvements			17,938,000
Sales and other reductions			(6,753,000)
Depreciation and Amortization			(8,142,000)
Balance at the end of the period	542,859,000		542,859,000
Commercial Mixed Use Property [Member] | Variable Interest Entity Primary Beneficiary [Member] | RBHTRB Newark Holdings LLC [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the beginning of the period			113,021,000
Additions			0
Capitalized Costs and Improvements			17,365,000
Sales and other reductions			0
Depreciation and Amortization			(1,072,000)
Balance at the end of the period	129,314,000		129,314,000
Land [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the beginning of the period			7,972,000
Additions			0
Capitalized Costs and Improvements			0
Sales and other reductions			0
Depreciation and Amortization			0
Balance at the end of the period	7,972,000		7,972,000
Retail Site [Member] | Variable Interest Entity Primary Beneficiary [Member] | RBHTRB Newark Holdings LLC [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the beginning of the period			2,678,000
Additions			0
Capitalized Costs and Improvements			4,000
Sales and other reductions			0
Depreciation and Amortization			(53,000)
Balance at the end of the period	2,629,000		2,629,000
Co Op Condominium Apartment Building [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at the beginning of the period			75,000
Additions			0
Capitalized Costs and Improvements			0
Sales and other reductions			(75,000)
Depreciation and Amortization			0
Balance at the end of the period	0		0
Newark NJ [Member] | Commercial Mixed Use Property [Member] | Variable Interest Entity Primary Beneficiary [Member] | RBHTRB Newark Holdings LLC [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Number of units (properties)	61		61
Areas of real estate (in sqft)	690,000		690,000
Mortgages [Member] | Pensacola, FL [Member] | Property Acquisition [Member] | Apartment Building [Member] | Affiliated Entity [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Number of units (properties)					276
Contract purchase price					27,950,000
Debt note					17,173,000
Payments to acquire interest in property					11,380,000
Property acquisition costs					295,000
Closing adjustments					308,000
Mortgages [Member] | Newark NJ [Member] | Commercial Mixed Use Property [Member] | Variable Interest Entity Primary Beneficiary [Member] | RBHTRB Newark Holdings LLC [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Notes payable	$ 19,500,000		$ 19,500,000
Construction in Progress [Member] | Newark NJ [Member] | Commercial Mixed Use Property [Member] | Variable Interest Entity Primary Beneficiary [Member] | RBHTRB Newark Holdings LLC [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Number of units (properties)	143		143
Areas of real estate (in sqft)	26,000		26,000