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Composition of Certain Balance Sheet Accounts - Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Employee compensation and benefits $ 14,640 $ 17,320
Airborne equipment and installation costs 5,819 4,981
Airborne partner related accrued liabilities 8,717 1,817
Airfone acquisition related liabilities 43 4,791
Other 20,576 20,237
Total accrued liabilities $ 49,795 $ 49,146