Investment in Unconsolidated Joint Ventures - Schedule of Unconsolidated Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	$ 55,550	$ 151,162
US Airways Building
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	39,760	42,501
Parkway's ownership percentage	74.58%
7000 Central Park JV, LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	15,790	15,490
Parkway's ownership percentage	40.00%
PKY CalSTRS Austin, LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	$ 0	$ 93,171
Parkway's ownership percentage	50.00%