ACQUISITIONS - Summary of Acquisitions Location and Services (Detail) - Entity	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Number of acquisitions	1	21	30
Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions		2	7
Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions	1	19	22
Communication and Related Services
Business Acquisition [Line Items]
Number of acquisitions			1
United States
Business Acquisition [Line Items]
Number of acquisitions	1	21
United States | Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions		2
United States | Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions	1	19
United States and Canada
Business Acquisition [Line Items]
Number of acquisitions			22
United States and Canada | Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions			2
United States and Canada | Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions			19
United States and Canada | Communication and Related Services
Business Acquisition [Line Items]
Number of acquisitions			1
International
Business Acquisition [Line Items]
Number of acquisitions			8
International | Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions			5
International | Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions			3