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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Details 2) | Mar. 31, 2014 sqft property | Mar. 31, 2013 property sqft
--- | --- | ---
Commercial real estate: |  |
Number of properties | 39 | 37
Rentable square feet | 9,686,055 | 7,856,859

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration