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Noncontrolling Interest (Narrative) (Details)
 3 Months Ended
Dec. 31, 2014
Oct. 31, 2014
Redeemable units conversion ratio 1qts_RedeemableUnitsConversionRatio  
Qualitytech, LP [Member]    
Quality Tech LP ownership percentage in operating partnership 20.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= qts_QualitytechLpMember		 21.20%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= qts_QualitytechLpMember
Class A Units [Member]    
Units redeemed for common stock 270,000qts_UnitsRedeemedForCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CapitalUnitClassAMember