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Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Revenue From Contracts With Customers [Line Items]    
Transaction price allocated to remaining performance obligations $ 66.2  
Service revenue occurring period 1 year  
Future equipment revenue recognition period next year  
Contract with Customer, Asset, Allowance for Credit Loss $ 0.3  
Airline [Member]    
Revenue From Contracts With Customers [Line Items]    
Contract assets, current and non-current 10.4 $ 3.1
Accounting Standards Update 2014-09 [Member]    
Revenue From Contracts With Customers [Line Items]    
Deferred revenue, current and non-current 2.5 $ 2.2
Connectivity and Entertainment Service Revenues [Member]    
Revenue From Contracts With Customers [Line Items]    
Transaction price allocated to remaining performance obligations 64.3  
Future Equipment Revenue [Member]    
Revenue From Contracts With Customers [Line Items]    
Equipment revenue $ 1.9