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Partners' Capital, Equity and Incentive Compensation Plans - Summary of Information About Awards Outstanding (Details)
6 Months Ended
Jun. 30, 2021
$ / shares
shares
QualityTech LP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding 75,435
QualityTech LP | Class O Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise prices (in dollars per share) | $ / shares $ 25.00
Awards outstanding 75,435
QTS Realty Trust, Inc.  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding 3,005,756
QTS Realty Trust, Inc. | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding 512,580
Remaining term of awards 10 months 24 days
QTS Realty Trust, Inc. | Performance-Based Relative TSR Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding 273,954
Remaining term of awards 10 months 24 days
QTS Realty Trust, Inc. | Performance-Based FFO Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding 237,669
Remaining term of awards 7 months 6 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 (in dollars per share) | $ / shares $ 21.00
Upper limit of exercise price (in dollars per share) | $ / shares $ 59.06
Awards outstanding 1,981,553
Remaining term of awards 8 months 12 days