Subsequent Events (Details) $ / shares in Units, $ in Millions	Apr. 11, 2016 USD ($)	Apr. 06, 2016 USD ($)	Apr. 28, 2016 USD ($) $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2015 $ / shares
Subsequent Event [Line Items]
Common stock, par value (in dollars per share) | $ / shares				$ 0.001	$ 0.001
City West Place | Mortgages | Subsequent Event
Subsequent Event [Line Items]
Amount of debt paid in full		$ 114.0
Lincoln Place | Mortgages | Subsequent Event
Subsequent Event [Line Items]
Amount of debt paid in full	$ 47.9
Scenario, Forecast
Subsequent Event [Line Items]
Possible termination fee if the Merger Agreement is terminated			$ 65.0
Possible expense incurred if the Merger Agreement is terminated			$ 20.0
Scenario, Forecast | Common Stock | Cousins Properties Inc.
Subsequent Event [Line Items]
Common stock, par value (in dollars per share) | $ / shares			$ 1.00
Scenario, Forecast | Common Stock | Parkway Properties Inc. | Cousins Properties Inc.
Subsequent Event [Line Items]
Possible conversion right to existing shareholders of Parkway Properties Inc			1.63
Scenario, Forecast | Limited Voting Preferred Stock | Cousins Properties Inc.
Subsequent Event [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares			$ 1.00
Scenario, Forecast | Limited Voting Preferred Stock | Parkway Properties Inc. | Cousins Properties Inc.
Subsequent Event [Line Items]
Possible conversion right to existing shareholders of Parkway Properties Inc			1.63