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Information Regarding Changes in ARRIS's Aggregate Product Warranty Liabilities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Product Warranty Liability [Line Items]    
Beginning balance $ 88,187 $ 49,027
Warranty reserve at acquisition 1,700 43,723
Accruals related to warranties (including changes in assumptions) 36,379 51,947
Settlements made (in cash or in kind) (50,177) (56,510)
Ending balance $ 76,089 $ 88,187