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Credit Facilities Senior Notes and Mortgage Notes Payable (Outstanding Debt Excluding Capital Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Outstanding debt $ 523,807us-gaap_DebtInstrumentCarryingAmount $ 624,167us-gaap_DebtInstrumentCarryingAmount
Unsecured Credit Facility [Member]    
Debt Instrument [Line Items]    
Outstanding debt 140,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_UnsecuredCreditFacilityMember		 239,838us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_UnsecuredCreditFacilityMember
Senior Notes Net of Discount [Member]    
Debt Instrument [Line Items]    
Outstanding debt 297,791us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_SeniorNotesNetOfDiscountMember		 297,729us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_SeniorNotesNetOfDiscountMember
Richmond Credit Facility [Member]    
Debt Instrument [Line Items]    
Outstanding debt 70,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_RichmondCreditFacilityMember		 70,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_RichmondCreditFacilityMember
Atlanta-Metro Equipment Loan [Member]    
Debt Instrument [Line Items]    
Outstanding debt $ 16,016us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_AtlantaMetroEquipmentLoanMember		 $ 16,600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_AtlantaMetroEquipmentLoanMember