Labor Union Contracts (Details) (Employees covered under collective bargaining agreements)	Dec. 31, 2014 Employee
Employees covered under collective bargaining agreements
Labor Union Contracts
Approximate percentage of employees who are members of bargaining units (as a percent)	48.00%
Collective bargaining arrangement, number of participating unionized employees	11,000

Represents the percentage of employees who are members of various bargaining units represented by the Communications Workers of America and the International Brotherhood of Electrical Workers.

No definition available.

Name:	ctq_PercentageOfEmployeesWhoAreMembersOfVariousBargainingUnits
Namespace Prefix:	ctq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant