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Acquisitions - Additional Information (Detail) - Drop Box [Member] - USD ($)
$ in Millions
Aug. 01, 2018
Sep. 30, 2018
Business Acquisition [Line Items]    
Total purchase price $ 7.9  
Deferred revenue acquired 0.2  
Accounts payable and accrued liabilities acquired   $ 0.4
Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-lived intangibles acquired 0.2  
Trade Name [Member]    
Business Acquisition [Line Items]    
Indefinite-lived intangible assets acquired 0.2  
Rental Equipment [Member]    
Business Acquisition [Line Items]    
Assets acquired $ 7.7