Management Contracts (Details) (USD $)	3 Months Ended		12 Months Ended				0 Months Ended
	Dec. 31, 2012	Jun. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 18, 2011	Dec. 19, 2013 Thomas Properties Group, Inc. [Member] Contract-Based Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Value of contracts		$ 51,800,000					$ 1,800,000
Management contracts, net	19,000,000		13,764,000	19,000,000
Management contractual amortization periods (in years)			2 years 8 months 12 days
Management contracts net prior to impairment	46,100,000		46,100,000	46,100,000
Impairment loss on management contracts and goodwill	42,000,000		0	41,967,000	0
Deferred tax liabilities			$ 2,000,000		$ 14,800,000	$ 14,800,000