Impairments and Restructuring Charges (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Jun. 30, 2014
Aug. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Impairments and Restructuring Charges [Line Items]                        
Accrued Restructuring Charges     $ 15,410,000   $ 8,250,000 $ 15,410,000   $ 8,250,000        
Asset impairment charges 47,900,000 38,200,000   85,300,000     22,800,000          
Severance Costs         48,400,000              
Restructuring charges   3,200,000 30,100,000   56,260,000              
Payments for Restructuring         (63,420,000)              
Restructuring, Settlement and Impairment Provisions         220,742,000 168,543,000 30,401,000          
Nextel Brazil And Nextel Mexico [Member]                        
Impairments and Restructuring Charges [Line Items]                        
Asset impairment charges         25,500,000              
ARGENTINA                        
Impairments and Restructuring Charges [Line Items]                        
Number of Employees Severed         20              
Asset impairment charges               84,700,000        
Restructuring, Settlement and Impairment Provisions         89,601,000 7,908,000 73,000          
MEXICO                        
Impairments and Restructuring Charges [Line Items]                        
Number of Employees Severed         1,170 800     800      
Asset impairment charges 5,100,000     9,000,000                
Restructuring, Settlement and Impairment Provisions         26,256,000 39,057,000 439,000          
BRAZIL                        
Impairments and Restructuring Charges [Line Items]                        
Number of Employees Severed         800              
Asset impairment charges 4,500,000                      
Restructuring, Settlement and Impairment Provisions         41,492,000 24,515,000 2,437,000          
Corporate Segment [Member]                        
Impairments and Restructuring Charges [Line Items]                        
Number of Employees Severed         85   50          
Loss on contract termination                   6,800,000    
Asset impairment charges       76,300,000         6,400,000   5,900,000  
Restructuring charges                       7,600,000
Restructuring, Settlement and Impairment Provisions         $ 63,393,000 $ 97,063,000 $ 27,452,000