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Partners' Capital, Equity and Incentive Compensation Plans (Summary of Information About Awards Outstanding) (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
QualityTech LP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 93,904
QTS Realty Trust, Inc.  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 2,598,488
Remaining term of awards 3 months 18 days
QTS Realty Trust, Inc. | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 472,748
Remaining term of awards 1 year 9 months 18 days
QTS Realty Trust, Inc. | Performance-Based Relative TSR Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 84,350
Remaining term of awards 2 years 9 months 18 days
QTS Realty Trust, Inc. | Performance-Based FFO Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 84,350
Remaining term of awards 2 years 9 months 18 days
QTS Realty Trust, Inc. | 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 1,957,040
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 93,904