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Credit Facilities Senior Notes and Mortgage Notes Payable (Outstanding Debt Excluding Capital Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Outstanding debt $ 624,167us-gaap_DebtInstrumentCarryingAmount $ 345,339us-gaap_DebtInstrumentCarryingAmount
Unsecured Credit Facility [Member]    
Debt Instrument [Line Items]    
Outstanding debt 239,838us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_UnsecuredCreditFacilityMember		 256,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_UnsecuredCreditFacilityMember
Senior Notes Net of Discount [Member]    
Debt Instrument [Line Items]    
Outstanding debt 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 $ 16,600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_AtlantaMetroEquipmentLoanMember		 $ 18,839us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= qts_AtlantaMetroEquipmentLoanMember