Investment in Unconsolidated Entities (Details Textual) - Real Estate Properties [Domain] $ in Thousands, CAD in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Sep. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)	Mar. 31, 2015 USD ($) Number	Mar. 31, 2015 CAD	Dec. 31, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 25, 2015	Mar. 31, 2015 CAD Number	Jan. 31, 2015	Jan. 30, 2015 Number	Aug. 18, 2014 Number	Mar. 31, 2014 Number	Jan. 31, 2014
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Value, Issued			$ 61		$ 61
Debt Instrument, Basis Spread on Variable Rate					2.50%
Consideration Paid for Amendment of Agreement	$ 4,000
Payments to Acquire Productive Assets		$ 230,600
Repayments of Debt		$ 106,700
35 Student Housing Properties [Member]
Schedule of Equity Method Investments [Line Items]
Percentage Of Ownership		48.00%
Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage							0.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage													47.00%
Maximum [Member] | HSRE-Campus Crest I, LLC Operating Agreement [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage													63.90%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage													20.00%
Minimum [Member] | HSRE-Campus Crest I, LLC Operating Agreement [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage													49.90%
Copper Beech [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint venture properties | Number			7					7		28		28
Canadian Dealer Offered Rate [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum			3.00%	3.00%
Debt Instrument, Basis Spread on Variable Rate			3.39%	3.39%
Debt Instrument, Maturity Date			Jan. 13, 2016	Jan. 13, 2016
The Grove at Greensboro [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Value, Issued			$ 2,700
The Grove at Louisville [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Value, Issued			2,700
Kentucky [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Value, Issued			$ 1,900
Preferred Class B [Member]
Schedule of Equity Method Investments [Line Items]
Return On Investment Of Properties			9.00%					9.00%
Preferred Class A [Member]
Schedule of Equity Method Investments [Line Items]
Preferred Stock, Value, Issued			$ 13,800					CAD 16.0
HSRE and DCV Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint venture properties | Number			11					11				14
HIM Holdings LP [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Assets, Investing Activities			$ 56,200	CAD 65.0
HIM Holdings LP [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage									47.00%
CSH Montreal [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			60.50%					60.50%
Payments to Acquire Assets, Investing Activities			$ 88,400	CAD 112.0
Return On Investment Of Properties			39.50%					39.50%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures			$ 800
CSH Montreal [Member] | Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures						$ 3,900
CSH Montreal [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate			3.39%	3.39%
CSH Montreal [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.00%	1.00%
Cb Portfolio [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	19.00%		48.00%					48.00%
Number of joint venture properties | Number			28					28			35
Cb Portfolio [Member] | Copper Beech [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint venture properties | Number										2
Beaumont and Partners [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage									53.00%
Cb Investors [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage											48.00%
Percentage of Ownership Interest Transferred	48.00%