INTERIM CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Preferred stock, liquidation preference	$ 25.00
Series A Redeemable Perpetual Preferred
Dividend rate (as a percent)	7.125%	7.125%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 25.00	$ 25.00
Preferred stock, shares authorized	4,600,000	4,600,000
Preferred stock, shares issued	4,280,000	4,280,000
Preferred stock, shares outstanding	4,280,000	4,280,000
Series A Redeemable Perpetual Preferred | Qualitytech, LP
Dividend rate (as a percent)	7.125%	7.125%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 25.00	$ 25.00
Preferred stock, shares authorized	4,600,000	4,600,000
Preferred stock, shares issued	4,280,000	4,280,000
Preferred stock, shares outstanding	4,280,000	4,280,000
Series B Convertible Preferred Units
Dividend rate (as a percent)	6.50%	6.50%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 100.00	$ 100.00
Preferred stock, shares authorized	3,162,500	3,162,500
Preferred stock, shares issued	3,162,500	3,162,500
Preferred stock, shares outstanding	3,162,500	3,162,500
Series B Convertible Preferred Units | Qualitytech, LP
Dividend rate (as a percent)	6.50%	6.50%
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 100.00	$ 100.00
Preferred stock, shares authorized	3,162,500	3,162,500
Preferred stock, shares issued	3,162,500	3,162,500
Preferred stock, shares outstanding	3,162,500	3,162,500
Common stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450,133,000	450,133,000
Common stock, shares issued	58,238,145	51,123,417
Common stock, shares outstanding	58,238,145	51,123,417
Common stock | Qualitytech, LP
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450,133,000	450,133,000
Common stock, shares issued	64,906,057	57,799,035
Common stock, shares outstanding	64,906,057	57,799,035