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RESTRUCTURING AND DIVESTITURES - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]    
Proceeds from sale of business $ 13.6  
Selling, General and Administrative Expenses    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges $ 5.3  
Restructuring charges approximate paid over period 2 years  
Restructuring charges future payments outstanding $ 5.1  
Selling, General and Administrative Expenses | Disposal Group, Held-for-sale, Not Discontinued Operations | United Kingdom    
Restructuring Cost And Reserve [Line Items]    
Non-cash impairment charges   $ 4.1
All Other | Selling, General and Administrative Expenses    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges 4.6  
International Regulated Waste And Compliance Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations | United Kingdom    
Restructuring Cost And Reserve [Line Items]    
Proceeds from sale of business 14.9  
International Regulated Waste And Compliance Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations | United Kingdom | Note Receivable Due in Nine Months    
Restructuring Cost And Reserve [Line Items]    
Proceeds from sale of business 1.3  
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges 0.6  
International Regulated Waste And Compliance Services | Selling, General and Administrative Expenses | Disposal Group, Disposed of by Sale, Not Discontinued Operations | United Kingdom    
Restructuring Cost And Reserve [Line Items]    
Pre-tax gain from sale 5.8  
Domestic And Canada Regulated Waste And Compliance Services | Selling, General and Administrative Expenses    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges $ 0.1