Noncontrolling Interest (Narrative) (Details)	3 Months Ended
Mar. 31, 2019	Oct. 13, 2013
Stock conversion ratio	1
Qualitytech, LP \| QTS Reality Trust
Quality Tech LP ownership percentage in operating partnership	10.80%	21.20%

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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