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Investment in Office Properties and Parking Properties - Business Combination Pro Forma (Details) - One Buckhead Plaza - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Acquisition [Line Items]        
Revenues $ 126,905 $ 114,634 $ 246,960 $ 222,725
Net income (loss) attributable to common stockholders $ 14,132 $ (9,106) $ 21,454 $ 2,032
Basic net income (loss) attributable to common stockholders (in dollars per share) $ 0.13 $ (0.09) $ 0.19 $ 0.02
Diluted net income (loss) attributable to common stockholders (in dollars per share) $ 0.13 $ (0.09) $ 0.19 $ 0.02