Partners' Capital, Equity and Incentive Compensation Plans (Summary of Information About Awards Outstanding) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Operating Partnership Awards Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	1,630,606
QTS Realty Trust, Inc Awards Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	744,578
QTS Realty Trust, Inc Awards Outstanding [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	152,629
Remaining term of awards	3 years
QTS Realty Trust, Inc Awards Outstanding [Member] | Options to purchase Class A common stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower limit of exercise price	$ 21
Upper limit of exercise price	$ 28.82
Awards Outstanding	591,949
Remaining term of awards	1 year
Class O Units [Member] | Operating Partnership Awards Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower limit of exercise price	$ 20
Upper limit of exercise price	$ 25
Awards Outstanding	1,547,293
Remaining term of awards	2 years
Class RS Units [Member] | Operating Partnership Awards Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	83,313
Remaining term of awards	2 years