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Description of Business and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]  
Schedule of Customer Concentration Risk
Concentrations of credit risk in relation to customers with an accounts receivable balance of 10% or greater of total accounts receivable and customers with net revenues of 10% or greater of total revenues are presented below for the periods indicated.
 
 
Percentage of Accounts Receivable
 
Percentage of Revenue
 
 
At December 31,
 
Years Ended December 31,
 
  
2012
 
2011
 
2012
 
2011
 
2010
CenturyLink
  
13%
 
12%
 
21%
 
20%
 
29%