Property Dispositions and Discontinued Operations (Details) (USD $)	3 Months Ended				6 Months Ended				3 Months Ended		0 Months Ended	6 Months Ended	0 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014 2020 W. 89th Street Building [Member]	Jun. 30, 2014 Two Park Center [Member]	Mar. 28, 2013 1111 Durham Avenue [Member]	Jun. 30, 2013 1111 Durham Avenue [Member]	May 01, 2013 1200 Enclave Parkway [Member]	Nov. 01, 2013 350 Spectrum Loop building [Member]	Dec. 30, 2013 8700 South Price Road [Member]	Mar. 19, 2014 11107 and 11109 Sunset Hills Road [Member]	Apr. 30, 2014 1441 West Long Lake Road [Member]	Apr. 30, 2014 4685 Investment Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price of building									$ 5,800,000
Gain/(Loss) on Sale									1,100,000
Net Sales Proceeds					46,240,000		49,326,000		5,500,000		3,752,000		45,552,000	29,676,000	16,682,000	22,326,000	7,202,000	11,199,000
Ownership interest (percentage)										72.00%
Sales price for equity method investment										6,300,000
Net sales proceeds received from unconsolidated joint ventures					6,017,000		0			6,000,000
Loss on sale of equity method investment										(200,000)
Gain on sale of real estate assets, net	1,304,000		16,258,000		1,198,000		16,258,000				(9,000)		16,246,000	7,959,000	7,087,000	(102,000)	562,000	747,000
Revenues:
Rental income	191,000		2,289,000		1,365,000		5,217,000
Tenant reimbursements	2,000		308,000		114,000		742,000
Property management fee revenue	1,000		0		1,000		0
Revenue	194,000		2,597,000		1,480,000		5,959,000
Expenses:
Property operating costs	(323,000)		921,000		182,000		2,407,000
Depreciation	0		596,000		83,000		1,455,000
Amortization	0		105,000		223,000		274,000
General and administrative	3,000		10,000		6,000		11,000
Expenses	(320,000)		1,632,000		494,000		4,147,000
Other income/(expense)
Other income/(expense)	0		13,000		(6,000)		25,000
Net recoveries from casualty events and litigation settlements	0		17,000		0		17,000
Nonoperating income (expense)	0		30,000		(6,000)		42,000
Operating income, excluding gain/(loss) on sale	514,000		995,000		980,000		1,854,000
Impairment loss	0	[1]	0	[1]	0	[1]	(6,402,000)	[1]				(6,400,000)
Income from discontinued operations	$ 1,818,000		$ 17,253,000		$ 2,178,000		$ 11,710,000

[1] Piedmont sold the 1111 Durham Avenue building in South Plainfield, New Jersey and recorded an impairment charge of $6.4 million based on the difference between carrying value and fair value of the asset at the time it was reclassified from real estate assets held-for-use (at cost) to real estate assets held for sale (at estimated fair value). The fair value measurement used in the evaluation of this non-financial asset was based upon the amount set forth in the purchaser's original letter of intent which approximated the land value of the asset due to the age of construction and lack of near term leasing prospects for the building.