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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Leases [Line Items]          
Amortization of deferred airborne lease incentives $ 8,630 $ 7,241 $ 17,978 $ 12,885  
Deferred airborne lease incentives included in current liabilities 35,342   35,342   $ 36,277
Deferred airborne lease incentives included in non-current liabilities 117,459   117,459   135,879
Revenue share expense, net of amortization of deferred airborne lease incentives 10,200 10,800 19,100 22,200  
Contingent annual cash rebates     1,800    
Property and equipment, gross 919,809   919,809   816,989
Present value of net minimum lease payments 4,427   4,427    
Present value of net minimum lease payments, current portion 2,613   2,613   2,799
Present value of net minimum lease payments, non-current portion 1,800   1,800    
Leased Computer Equipment [Member]          
Leases [Line Items]          
Property and equipment, gross 5,100   5,100   3,900
Leased Network Equipment [Member]          
Leases [Line Items]          
Property and equipment, gross 7,500   7,500   $ 7,500
Certain Facilities and Equipment [Member]          
Leases [Line Items]          
Rental expense 3,000 2,900 6,000 6,000  
Cell Site Leases [Member]          
Leases [Line Items]          
Rental expense $ 2,400 $ 2,400 $ 4,700 $ 4,700  
Minimum [Member] | Computer Equipment [Member]          
Leases [Line Items]          
Annual interest rate imputed     8.00%    
Maximum [Member] | Computer Equipment [Member]          
Leases [Line Items]          
Annual interest rate imputed     14.00%