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Partners' Capital, Equity and Incentive Compensation Plans (Summary of Information About Awards Outstanding) (Details)
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Operating Partnership  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 582,665
QTS Realty Trust, Inc Awards Outstanding  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 1,813,203
QTS Realty Trust, Inc Awards Outstanding | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 442,996
Remaining term of awards 1 year 9 months 18 days
QTS Realty Trust, Inc Awards Outstanding | Options to purchase Class A common stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Lower limit of exercise price | $ / shares $ 21.00
Upper limit of exercise price | $ / shares $ 50.66
Awards Outstanding 1,370,207
Remaining term of awards 10 months 24 days
Class O Units | Operating Partnership  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Lower limit of exercise price | $ / shares $ 20.00
Upper limit of exercise price | $ / shares $ 25.00
Awards Outstanding 582,665
Remaining term of awards 0 years