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Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue from Contracts with Customers [Line Items]          
Transaction price allocated to remaining performance obligations $ 784.0   $ 784.0    
Service revenue occurring period     1 year    
Future equipment revenue recognition period     next one to three years    
Future Equipment Revenue [Member]          
Revenue from Contracts with Customers [Line Items]          
Equipment revenue     $ 101.0    
Connectivity and Entertainment Service Revenues [Member]          
Revenue from Contracts with Customers [Line Items]          
Transaction price allocated to remaining performance obligations 683.0   683.0    
Airline [Member]          
Revenue from Contracts with Customers [Line Items]          
Contract assets, current and non-current 81.0   81.0   $ 59.9
Accounting Standards Update 2014-09 [Member]          
Revenue from Contracts with Customers [Line Items]          
Deferred revenue, current and non-current 56.2   56.2   60.1
Deferred STC costs 19.3   19.3   $ 16.5
Accounting Standards Update 2014-09 [Member] | Engineering, Design and Development [Member]          
Revenue from Contracts with Customers [Line Items]          
Amortization expense $ 0.3 $ 0.2 $ 0.6 $ 0.4