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Acquired Customer Base - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jan. 16, 2018
Sep. 30, 2018
Dec. 31, 2017
Customer Relationships      
Business Acquisition [Line Items]      
Total consideration allocated between intangible assets   $ 22.0  
Estimated Lives   5 years  
TSA      
Business Acquisition [Line Items]      
Total consideration allocated between intangible assets   $ 2.0  
Estimated Lives   1 year  
Transitioned Customer Base      
Business Acquisition [Line Items]      
Total consideration allocated between intangible assets   $ 10.0  
Estimated Lives   5 years  
Non-Transitioned Customer Base      
Business Acquisition [Line Items]      
Total consideration allocated between intangible assets   $ 12.0  
Business combination, estimated potential future payments   $ 2.0  
Maximum | Customer Relationships      
Business Acquisition [Line Items]      
Estimated Lives   5 years 5 years
Minimum | Customer Relationships      
Business Acquisition [Line Items]      
Estimated Lives   2 years 2 years
RingCentral Office@Hand solution      
Business Acquisition [Line Items]      
Total purchase consideration   $ 24.0  
Cash payments $ 20.0 20.0  
Earn-out payments   $ 4.0  
Customer base transition expected completion period 1 year    
Period of transition services agreement 1 year    
RingCentral Office@Hand solution | Maximum      
Business Acquisition [Line Items]      
Total purchase consideration $ 26.0    
Earn-out payments $ 6.0