v2.4.0.8
Leases - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases [Line Items]      
Amortization of deferred airborne lease incentives $ 8,074,000 $ 3,671,000 $ 1,456,000
Deferred airborne lease incentives included in current liabilities 9,005,000 5,917,000  
Deferred airborne lease incentives included in non-current liabilities 53,012,000 40,043,000  
Property, plant and equipment 265,634,000 197,674,000  
Present value of net minimum lease payments 4,194,000    
Present value of net minimum lease payments, Current portion 1,200,000    
Present value of net minimum lease payments, Non-current portion 3,000,000    
Computer equipment [Member]
      
Leases [Line Items]      
Annual interest rate imputed 10.00%    
Property, plant and equipment 1,200,000    
Network equipment [Member]
      
Leases [Line Items]      
Property, plant and equipment 3,600,000    
Airborne Lease [Member]
      
Leases [Line Items]      
Revenue share expense, net of amortization of deferred airborne lease incentives 33,300,000 21,100,000 8,500,000
Certain Facilities and Equipment [Member]
      
Leases [Line Items]      
Rental expense 5,700,000 5,000,000 4,300,000
Cell Site Leases [Member]
      
Leases [Line Items]      
Rental expense $ 7,600,000 $ 6,200,000 $ 5,500,000
Initial non-cancelable term 5 years    
Number of lease renewals   4