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Business Segments and Major Customers - Summary of Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Service revenue $ 153,347 $ 129,099 $ 453,918 $ 375,406
Equipment revenue 19,527 18,168 57,162 61,146
Total revenue 172,874 147,267 511,080 436,552
Segment profit (loss) 13,185 15,240 33,894 43,916
CA-NA [Member]        
Segment Reporting Information [Line Items]        
Service revenue 94,436 88,534 290,260 261,751
Equipment revenue 1,291 2,191 5,234 8,708
Total revenue 95,727 90,725 295,494 270,459
Segment profit (loss) 15,966 14,509 43,316 46,966
CA-ROW [Member]        
Segment Reporting Information [Line Items]        
Service revenue 15,687 7,235 38,243 17,213
Equipment revenue 953 360 2,756 731
Total revenue 16,640 7,595 40,999 17,944
Segment profit (loss) (24,110) (19,924) (82,068) (62,945)
BA [Member]        
Segment Reporting Information [Line Items]        
Service revenue 43,224 33,330 125,415 96,442
Equipment revenue 17,283 15,617 49,172 51,707
Total revenue 60,507 48,947 174,587 148,149
Segment profit (loss) $ 21,329 $ 20,655 $ 72,646 $ 59,895