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Guarantees (Tables)
12 Months Ended
Dec. 31, 2018
Guarantees and Product Warranties [Abstract]  
Schedule of changes in ARRIS's aggregate product warranty liabilities
  2018  2017 
Beginning balance $76,089  $88,187 
Warranty reserve at acquisition  827   1,700 
Accruals related to warranties (including changes in assumptions)  31,020   36,379 
Settlements made (in cash or in kind)  (44,460)  (50,177)
Ending balance $63,476  $76,089