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Real Estate Investments (Details Textuals) (USD $) | Sep. 30, 2011 | Aug. 12, 2011 sqft | Jan. 20, 2011 | Mar. 28, 2011 Overlook I And II [Member] sqft | Jan. 20, 2011 Parcel of land in PA [Member] | Jan. 20, 2011 Parcel of land in PA [Member] Partnership Interest [Member] | Jun. 30, 2011 Three Logan Square [Member] sqft | Aug. 05, 2010 Three Logan Square [Member] Storey | Aug. 05, 2010 Three Logan Square [Member] Partnership Interest [Member] Units
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Real Estate Investments (Textuals) [Abstract] |  |  |  |  |  |  |  |  |
Net rentable space of property acquired |  | 192,707 |  | 126,496 |  |  | 1,000,000 |  |
Recognized tenant and other receivables from acquisition |  |  |  |  |  |  |  | $ 1,100,000 |
Prepaid real estate taxes from acquisition |  |  |  |  |  |  |  | 1,500,000 |
Advance under credit facility |  | 600,000,000 |  |  |  |  |  |  |
Acquisition related costs |  | 300,000 |  |  | 500,000 |  |  | 400,000 |
Number of storey of office tower acquired |  |  |  |  |  |  |  | 53 |
Business Acquisition, Equity Interest Issued or Issuable, Description |  |  |  |  |  | 50% limited interest in the partnership |  |  |
Business Acquisition, Equity Interest Issued or Issuable |  |  | 50.00% |  |  |  |  |  |
Business Acquisition, consideration received |  |  |  |  | 4,900,000 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Units |  |  |  |  |  |  |  |  | 7,111,112
Lease percentage of acquired property | 57.20% |  |  | 100.00% |  |  | 67.20% |  |
Acquisitions through cash |  |  |  |  |  |  |  | 51,200,000 |
Assumed security deposits obligations | 700,000 |  |  |  |  |  |  | 900,000 |
Closing market price of Parent Company's common shares on acquisition date |  |  |  |  |  |  |  | 11.54 |
Annual dividend rate per share |  |  |  |  |  |  |  | $ 0.60 |
Net amount of cash paid after assumed liabilities |  |  |  |  |  |  |  | 50,300,000 |
Acquired real estate, cost of property |  | 18,800,000 |  | 12,600,000 | 9,300,000 |  |  | 129,000,000 |
Business acquisition, purchase price allocated to building |  | 21,400,000 |  |  |  |  |  |  |
Business acquisition, purchase price allocated to intangible assets |  | 12,000,000 |  |  |  |  |  |  |
Business acquisition, purchase price allocated to market lease liabilities |  | 14,400,000 |  |  |  |  |  |  |
Business acquisition, purchase price allocated to other assets |  | 200,000 |  |  |  |  |  |  |
Business acquisition, purchase price allocated to assumed liabilities |  | $ 400,000 |  |  |  |  |  |  |

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