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Partners' Capital, Equity and Incentive Compensation Plans (Summary of Information About Awards Outstanding) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
QualityTech LP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 568,040
QTS Realty Trust, Inc Awards Outstanding  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 1,751,134
QTS Realty Trust, Inc Awards Outstanding | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 381,864
Remaining term of awards 1 year 8 months 12 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 1,369,270
Remaining term of awards 9 months 18 days
Class O Units | QualityTech LP  
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 568,040