CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450,133,000	450,133,000
Common stock, shares issued	51,123,417	50,701,795
Common stock, shares outstanding	51,123,417	50,701,795
Series A Redeemable Perpetual Preferred [Member]
Dividend rate (as a percent)	7.125%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 25.00	$ 25.00
Preferred stock, authorized	4,600,000	0
Preferred stock, issued	4,280,000	0
Preferred stock, outstanding	4,280,000	0
Series B Convertible Preferred Stock [Member]
Dividend rate (as a percent)	6.50%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 100.00	$ 100.00
Preferred stock, authorized	3,162,500	0
Preferred stock, issued	3,162,500	0
Preferred stock, outstanding	3,162,500	0
Series A Redeemable Perpetual Preferred Units [Member] | Qualitytech, LP
Dividend rate (as a percent)	7.125%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 25.00	$ 25.00
Preferred stock, authorized	4,600,000	0
Preferred stock, issued	4,280,000	0
Preferred stock, outstanding	4,280,000	0
Series B Convertible Preferred Units [Member] | Qualitytech, LP
Dividend rate (as a percent)	6.50%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 100.00	$ 100.00
Preferred stock, authorized	3,162,500	0
Preferred stock, issued	3,162,500	0
Preferred stock, outstanding	3,162,500	0
Common units: $0.01 par value, 450,133,000 units authorized, 57,799,035 and 57,245,524 units issued and outstanding as of December 31, 2018 and December 31, 2017, respectively | Qualitytech, LP
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450,133,000	450,133,000
Common stock, shares issued	57,799,035	57,245,524
Common stock, shares outstanding	57,799,035	57,245,524