INTERIM CONSOLIDATED FINANCIAL STATEMENTS BALANCE SHEETS (Parenthetical) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 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 outstanding	3,162,500	3,162,500
Common stock, shares issued	3,162,500	3,162,500
Common units: $0.01 par value, 450,133,000 units authorized, 62,027,587 and 57,799,035 units issued and outstanding as of March 31, 2019 and December 31, 2018, respectively
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450,133,000	450,133,000
Common stock, shares issued	55,353,643	51,123,417
Common stock, shares outstanding	55,353,643	51,123,417
Common units: $0.01 par value, 450,133,000 units authorized, 62,027,587 and 57,799,035 units issued and outstanding as of March 31, 2019 and December 31, 2018, 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	62,027,587	62,027,587
Common stock, shares outstanding	57,799,035	57,799,035