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Operating Leases, as Lessee (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 property	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Number of data center facilities on lease	2
Rent expense under operating leases	$ 5,900,000us-gaap_OperatingLeasesRentExpenseNet	$ 5,800,000us-gaap_OperatingLeasesRentExpenseNet	$ 6,500,000us-gaap_OperatingLeasesRentExpenseNet
Capitalized rent	$ 0qts_CapitalizedRent	$ 0qts_CapitalizedRent	$ 0qts_CapitalizedRent
Santa Clara [Member]
Operating Leased Assets [Line Items]
Sublease expiration period	2052-10