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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Parenthetical) (Details) - USD ($) $ in Thousands | Mar. 02, 2016 | Mar. 31, 2016 | Jan. 29, 2016 | Dec. 31, 2015 | Jan. 25, 2013
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Segment Reporting Information [Line Items] |  |  |  |  |
Other liabilities |  | $ 37,749 |  | $ 31,379 |
evo at Cira Centre South Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cash paid to acquire real estate ventures | $ 12,800 |  |  |  |
Equity method investment percentage of interests acquired by the Company and HSRE | 30.00% |  |  |  |
Equity method investment percentage | 50.00% |  |  |  | 30.00%
evo at Cira Centre South Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | HSRE, LLC [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cash paid to acquire real estate ventures | $ 6,600 |  |  |  |
Equity method investment percentage | 50.00% |  |  |  | 40.00%
Coppell Associates [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Equity method investment percentage |  |  | 50.00% |  |
Other liabilities |  |  |  | $ 1,100 |

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