Income Taxes - Additional Information (Detail)	9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]
Percentage distribution of RETI taxable income to its stockholder	90.00%

Minimum percentage of distribution of taxable income to stockholders.

No definition available.

Name:	qts_MinimumPercentageOfDistributionOfTaxableIncomeToStockholders
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration