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Partners' Capital, Equity and Incentive Compensation Plans (Summary of Award Activity Under 2010 Equity Incentive Plan and 2013 Equity Incentive Plan and Related Information) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
2013 Equity Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Weighted average exercise price units $ 22.87qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Weighted average exercise price units, Granted $ 36.14qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Weighted average exercise price units, Exercised $ 21.00qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [1]
Weighted average exercise price units, Released from restriction    [2]
Weighted average exercise price units, Cancelled/Expired $ 21.00qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndExpiredInPeriodWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [3]
Ending balance, Weighted average exercise price units $ 27.60qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Beginning balance, Weighted average fair value $ 4.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Weighted average fair value, Granted $ 8.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Weighted average fair value, Exercised $ 3.52qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [1]
Weighted average fair value, Released from restriction    [2]
Weighted average fair value, Cancelled/Expired $ 3.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [3]
Ending balance, Weighted average fair value $ 5.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Beginning balance, Weighted average exercise price options outstanding $ 29.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Weighted average exercise price options outstanding, Granted $ 35.88us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Weighted average exercise price options outstanding, Exercised $ 23.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [1]
Weighted average exercise price options outstanding, Released from restriction    [2]
Weighted average exercise price options outstanding, Cancelled/Expired $ 24.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [3]
Ending balance, Weighted average exercise price options outstanding $ 32.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
2013 Equity Incentive Plan [Member] | Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of units 584,949us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Number of units, granted 312,997us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Number of units, Exercised (5,406)qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsExercisedInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [1]
Number of units, Released from restriction    [2]
Number of units, Cancelled/Expired (8,594)qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndExpiredInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [3]
Ending balance, Number of units 883,946us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
2013 Equity Incentive Plan [Member] | Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options Outstanding 246,785us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Options, Granted 170,696us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
Options, Exercised (13,448)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [1]
Options, Released from restriction    [2]
Options, Cancelled/Expired (7,091)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember		 [3]
Ending balance, Options Outstanding 396,942us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= qts_TwoThousandThirteenEquityIncentivePlanMember
2010 Equity Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Weighted average exercise price units $ 23.49qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
Weighted average exercise price units, Granted   
Weighted average exercise price units, Exercised $ 21.71qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember		 [1]
Weighted average exercise price units, Released from restriction    [2]
Weighted average exercise price units, Cancelled/Expired    [3]
Ending balance, Weighted average exercise price units $ 23.52qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisedPrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
Beginning balance, Weighted average fair value $ 3.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
Weighted average fair value, Granted   
Weighted average fair value, Exercised $ 3.97qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember		 [1]
Weighted average fair value, Released from restriction    [2]
Weighted average fair value, Cancelled/Expired    [3]
Ending balance, Weighted average fair value $ 3.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
Beginning balance, Weighted average exercise price options outstanding $ 23.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
Weighted average exercise price options outstanding, Granted   
Weighted average exercise price options outstanding, Exercised    [1]
Weighted average exercise price options outstanding, Released from restriction $ 25.00qts_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsReleasedFromRestrictionWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember		 [2]
Weighted average exercise price options outstanding, Cancelled/Expired    [3]
Ending balance, Weighted average exercise price options outstanding $ 23.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
Restricted Class A Common Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Units surrendered 7,091us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_StatementClassOfStockAxis
= qts_RestrictedClassCommonStockMember
Class O Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ending balance, Number of units 700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_StatementClassOfStockAxis
= qts_ClassOMember
Class O Units [Member] | 2010 Equity Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of units 1,518,717us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= qts_ClassOMember
Number of units, granted   
Number of units, Exercised (23,939)qts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsExercisedInPeriodGross
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= qts_ClassOMember		 [1]
Number of units, Released from restriction    [2]
Number of units, Cancelled/Expired    [3]
Ending balance, Number of units 1,494,778us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= qts_ClassOMember
Class RS Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ending balance, Number of units 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_StatementClassOfStockAxis
= qts_ClassRsMember
Class RS Units [Member] | 2010 Equity Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options Outstanding 74,625us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= qts_ClassRsMember
Options, Granted   
Options, Exercised    [1]
Options, Released from restriction (8,687)qts_StockIssuedDuringPeriodSharesStockOptionsReleasedFromRestriction
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= qts_ClassRsMember		 [2]
Options, Cancelled/Expired    [3]
Ending balance, Options Outstanding 65,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= qts_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= qts_ClassRsMember
[1] This represents the Class A common stock that has been released from restriction and which was not surrendered by the holder to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted common stock.
[2] This represents Class RS units that upon vesting have converted to Operating Partnership units.
[3] Includes 7,091 of restricted Class A common stock surrendered by certain employees to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted common stock.