Credit facility covenant, maximum distribution payout ratio of funds from operations

No definition available.

Name:	qts_CreditFacilityCovenantMaximumDistributionPayoutRatioOfFundsFromOperations
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Credit facility covenant minimum tangible net worth

+ References

No definition available.

+ Details

Name:	qts_CreditFacilityCovenantMinimumTangibleNetWorth
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Credit facility covenant, percentage of net equity offering proceeds and interest in Operating Partnership in addition to minimum tangible net worth requirement

+ References

No definition available.

+ Details

Name:	qts_CreditFacilityCovenantPercentOfNetEquityOfferingProceedsAndInterestInOperatingPartnershipPlusMinimumTangibleNetWorth
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt extension period

+ References

No definition available.

+ Details

Name:	qts_DebtExtensionPeriod
Namespace Prefix:	qts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Maturity Year

+ References

No definition available.

+ Details

Name:	qts_DebtInstrumentMaturityYear
Namespace Prefix:	qts_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

The ratio of consolidated EBITDA, subject to certain adjustments, to consolidated fixed charges

+ References

No definition available.

+ Details

Name:	qts_FixedChargeCoverageRatio
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Leverage Ratio Limit Under Existing Revolving Credit Facility

+ References

No definition available.

+ Details

Name:	qts_LeverageRatioLimitUnderExistingRevolvingCreditFacility
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility accordion feature.

+ References

No definition available.

+ Details

Name:	qts_LineOfCreditFacilityAccordionFeature
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Credit facility agreement date.

+ References

No definition available.

+ Details

Name:	qts_LineOfCreditFacilityAgreementDate
Namespace Prefix:	qts_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum the credit facility may be increased up until

+ References

No definition available.

+ Details

Name:	qts_MaximumCreditFacilityMayBeIncreasedUpUntil
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum percentage of unemcumbered asset pool capitalized value

+ References

No definition available.

+ Details

Name:	qts_MaximumPercentageOfUnemcumberedAssetPoolCapitalizedValue
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage change in maximum leverage ratio required for incremental decrease in interest rate

+ References

No definition available.

+ Details

Name:	qts_PercentageChangeInMaximumLeverageRatioRequiredForIncrementalDecreaseInInterestRate
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Unencumbered asset pool debt service ratio

+ References

No definition available.

+ Details

Name:	qts_UnencumberedAssetPoolDebtServiceRatio
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Unencumbered asset pool debt yield limit

+ References

No definition available.

+ Details

Name:	qts_UnencumberedAssetPoolDebtYieldLimit
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityCovenantTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=qts_OperatingPartnershipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=qts_UnsecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qts_UnsecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
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Period Type:

Credit Facilities Senior Notes and Mortgage Notes Payable (Unsecured Credit Facility Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	6 Months Ended
	Jul. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Jul. 23, 2014
Term Loan [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 150,000,000	$ 225,000,000	$ 100,000,000	$ 100,000,000	100,000,000
Unsecured credit facility term		5 years
Repayment of term loan	75,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		350,000,000	550,000,000	550,000,000	550,000,000
Unsecured credit facility term		4 years	4 years
Debt extension period		1 year	1 year
Line of credit facility accordion feature		100,000,000
Credit facility availability			550,000,000	550,000,000	550,000,000
Maximum percentage of unencumbered asset pool capitalized value			60.00%	60.00%	60.00%
Unencumbered asset pool debt service ratio			170.00%	170.00%	170.00%
Unencumbered asset pool debt yield limit			14.00%	14.00%	14.00%
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding			2,500,000	2,500,000	2,500,000
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			30,000,000	30,000,000	30,000,000
Unsecured credit facility term			5 years
Maximum the credit facility may be increased up until			850,000,000	850,000,000	850,000,000
Credit facility covenant terms				(i) the outstanding principal balance of the loans and letter of credit liabilities cannot exceed the unencumbered asset pool availability (as defined in the credit agreement), (ii) a maximum leverage ratio of total indebtedness to gross asset value not in excess of 60%, (iii) a minimum fixed charge coverage ratio (defined as the ratio of consolidated EBITDA, subject to certain adjustments, to consolidated fixed charges) for the prior two most recently-ended calendar quarters of not less than 1.70 to 1.00, (iv) tangible net worth of at least $645 million plus 85% of the sum of net equity offering proceeds and the value of interests in the Operating Partnership issued upon contribution of assets to the Operating Partnership or its subsidiaries, (v) unhedged variable rate debt not greater than 35% of gross asset value and (vi) a maximum distribution payout ratio of the greater of (a) 95% of our "funds from operations" (as defined in the agreement) and (b) the amount required for QTS to qualify as a REIT under the Code.
Fixed charge coverage ratio			170.00%	170.00%	170.00%
Credit facility covenant minimum tangible net worth			645,000,000	645,000,000	645,000,000
Ratio of indebtedness to net capital			0.35	0.35	0.35
Credit facility covenant, maximum distribution payout ratio of funds from operations			95.00%	95.00%	95.00%
Percentage change in maximum leverage ratio required for incremental decrease in interest rate			5.00%	5.00%	5.00%
Credit facility, interst rate at end of period			1.84%	1.84%	1.84%
Operating Partnership [Member] \| Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility covenant, percentage ownership requirements in addition to minimum tangible net worth			85.00%	85.00%	85.00%
Minimum [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				1.65%
Minimum [Member] \| Term Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				0.65%
Minimum [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				1.70%
Minimum [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				0.70%
Maximum [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				2.20%
Maximum [Member] \| Term Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				1.20%
Maximum [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				2.25%
Maximum [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate percentage				1.25%
Maximum [Member] \| Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Leverage ratio			60.00%	60.00%	60.00%
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility agreement date		May 01, 2013
Credit facility maximum borrowing capacity		575,000,000	650,000,000	650,000,000	650,000,000
Letter of credit outstanding			239,800,000	239,800,000	239,800,000
Unsecured Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Letter of credit outstanding			100,000,000	100,000,000	100,000,000
Unsecured Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letter of credit outstanding			$ 139,800,000	$ 139,800,000	139,800,000
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes due				2022	2022
Interest rate			5.875%	5.875%	5.875%	5.875%