Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 03, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Registrant Name	QTS Realty Trust, Inc.
Entity Central Index Key	0001577368
Entity Filer Category	Accelerated Filer
Current Fiscal Year End Date	--12-31
Qualitytech, LP [Member]
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Registrant Name	QualityTech, LP
Entity Central Index Key	0001561164
Entity Filer Category	Non-accelerated Filer
Current Fiscal Year End Date	--12-31
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		41,019,436
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		133,000