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Significant Components of ARRIS's Valuation Allowance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance [Line Items]        
Valuation allowance $ (91,743) $ (57,772) $ (87,788) $ (118,629)
Domestic Tax Authority        
Valuation Allowance [Line Items]        
Valuation allowance, other (4,241) (16,792)    
Domestic Tax Authority | NOL        
Valuation Allowance [Line Items]        
Valuation allowance, NOL (8,578) (8,064)    
State and Local Jurisdiction | Georgia        
Valuation Allowance [Line Items]        
Valuation allowance, NOL (15,008) (3,464)    
State and Local Jurisdiction | Pennsylvania        
Valuation Allowance [Line Items]        
Valuation allowance, NOL (10,068) (6,596)    
State and Local Jurisdiction | Other US States        
Valuation Allowance [Line Items]        
Valuation allowance, NOL (8,988) (3,265)    
Valuation allowance, R&D (15,606) (10,438)    
State and Local Jurisdiction | California        
Valuation Allowance [Line Items]        
Valuation allowance, R&D (18,773)      
Foreign Tax Authority        
Valuation Allowance [Line Items]        
Valuation allowance, NOL $ (10,481) $ (9,153)