ACQUISITIONS - Summary of Acquisitions Location and Services (Detail) - Entity	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Number of acquisitions	21	30	31
Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions	2	7	11
Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions	19	22	19
Communication and Related Services
Business Acquisition [Line Items]
Number of acquisitions		1	1
United States
Business Acquisition [Line Items]
Number of acquisitions	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	19
United States and Canada
Business Acquisition [Line Items]
Number of acquisitions		22	21
United States and Canada | Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions		2	5
United States and Canada | Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions		19	15
United States and Canada | Communication and Related Services
Business Acquisition [Line Items]
Number of acquisitions		1	1
International
Business Acquisition [Line Items]
Number of acquisitions		8	10
International | Regulated Waste
Business Acquisition [Line Items]
Number of acquisitions		5	6
International | Secure Information Destruction
Business Acquisition [Line Items]
Number of acquisitions		3	4