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Business Segments and Major Customers - Summary of Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Service revenue $ 150,678 $ 146,495
Equipment revenue 81,147 18,911
Total revenue 231,825 165,406
Segment profit (loss) 11,374 10,719
CA-NA [Member]    
Segment Reporting Information [Line Items]    
Service revenue 88,783 97,145
Equipment revenue 55,038 1,671
Total revenue 143,821 98,816
Segment profit (loss) 1,656 11,159
CA-ROW [Member]    
Segment Reporting Information [Line Items]    
Service revenue 14,245 9,368
Equipment revenue 4,924 918
Total revenue 19,169 10,286
Segment profit (loss) (22,605) (26,555)
BA [Member]    
Segment Reporting Information [Line Items]    
Service revenue 47,650 39,982
Equipment revenue 21,185 16,322
Total revenue 68,835 56,304
Segment profit (loss) $ 32,323 $ 26,115