Condensed Consolidating Financial Information (Condensed Consolidating Statements of Cash Flow) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 41,161	$ 29,650
Cash flow from investing activities:
Acquisitions, net of cash acquired	(288,865)	(73,300)
Additions to property and equipment	(170,150)	(114,157)
Cash used in investing activities	(459,015)	(187,457)
Cash flow from financing activities:
Credit facility proceeds	350,162	182,500
Debt repayment	(260,000)
Payment of deferred financing costs	(512)	(924)
Payment of cash dividend	(19,673)	(15,368)
Principal payments on capital lease obligation	(1,227)	(367)
Scheduled mortgage principal debt repayments	(16,600)	(1,100)
Equity proceeds, net of costs	370,074
Net cash provided by financing activities	417,810	160,087
Net (decrease) increase in cash and cash equivalents	(44)	2,279
Cash and cash equivalents, beginning of period	10,788	5,210
Cash and cash equivalents, end of period	10,744	7,489
Qualitytech, LP [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	41,161	29,650
Cash flow from investing activities:
Acquisitions, net of cash acquired	(288,865)	(73,300)
Additions to property and equipment	(170,150)	(114,157)
Cash used in investing activities	(459,015)	(187,457)
Cash flow from financing activities:
Credit facility proceeds	350,162	182,500
Debt repayment	(260,000)
Payment of deferred financing costs	(512)	(924)
Payment of cash dividend	(19,673)	(15,368)
Partnership distributions	(4,414)	(4,654)
Principal payments on capital lease obligation	(1,227)	(367)
Scheduled mortgage principal debt repayments	(16,600)	$ (1,100)
Equity proceeds, net of costs	370,074
Net cash provided by financing activities	417,810	$ 160,087
Net (decrease) increase in cash and cash equivalents	(44)	2,279
Cash and cash equivalents, beginning of period	10,788	5,210
Cash and cash equivalents, end of period	10,744	$ 7,489
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	36,534
Cash flow from investing activities:
Acquisitions, net of cash acquired	(288,865)
Additions to property and equipment	(170,150)
Cash used in investing activities	(459,015)
Cash flow from financing activities:
Credit facility proceeds	350,162
Debt repayment	(260,000)
Payment of deferred financing costs	(512)
Payment of cash dividend	(19,673)
Partnership distributions	(4,414)
Principal payments on capital lease obligation	(1,227)
Scheduled mortgage principal debt repayments	(16,600)
Equity proceeds, net of costs	370,074
Net cash provided by financing activities	417,810
Net (decrease) increase in cash and cash equivalents	(4,671)
Cash and cash equivalents, beginning of period	10,788
Cash and cash equivalents, end of period	6,117
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	4,627
Cash flow from financing activities:
Net (decrease) increase in cash and cash equivalents	4,627
Cash and cash equivalents, end of period	$ 4,627