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Canadian ATG Spectrum License - Summary of Amortization Expense (Detail) - License Agreement [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Schedule Of Estimated Future Amortization Expense [Line Items]  
2015 (period from October 1 to December 31) $ 25
2016 97
2017 97
2018 97
2019 97
Thereafter $ 1,707