ACQUISITIONS - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($) Entity	Jun. 30, 2016 Entity	Mar. 31, 2016 Entity	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Entity	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Number of acquisitions | Entity			10	7		22
Net increase (decrease) in goodwill						$ 40,336		$ 1,450,950
Net increase in goodwill related to current year						40,336		1,450,950
Effect of goodwill on income taxes		$ 35,400				35,400
Net increase in Intangible Assets		23,235				23,235
Acquisition related expenses		2,265			$ 33,674	7,862	$ 39,956
Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition related expenses						7,862	$ 39,956
Customer relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets						$ 22,400
Customer relationships | Minimum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, useful life						10 years
Customer relationships | Maximum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, useful life						40 years
Covenants not-to-compete
Business Acquisition [Line Items]
Acquired finite-lived intangible assets						$ 800
Acquired finite-lived intangible assets, useful life						5 years
Shred-It Acquisition
Business Acquisition [Line Items]
Net increase in Intangible Assets		$ 158,940				$ 158,940
Additional cash consideration paid	$ 9,500
Romania
Business Acquisition [Line Items]
Number of acquisitions | Entity						2
Spain
Business Acquisition [Line Items]
Number of acquisitions | Entity						2
Republic of Korea
Business Acquisition [Line Items]
Number of acquisitions | Entity						1
United Kingdom
Business Acquisition [Line Items]
Number of acquisitions | Entity						1
United States
Business Acquisition [Line Items]
Number of acquisitions | Entity		5
United States | Secure information destruction business
Business Acquisition [Line Items]
Number of acquisitions | Entity		4	3	4
United States | Acquisition One | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity				1
Business acquisition, ownership percentage acquired	100.00%			100.00%
United States | Acquisition One | Communication and Related Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity		1
United States | Acquisition Three | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity			3
International | Romania | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity			1	1
International | Spain | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity			1	1
International | Republic of Korea | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity			1
International | United Kingdom | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions | Entity			1
Domestic Regulated Waste and Compliance Services
Business Acquisition [Line Items]
Net increase (decrease) in goodwill						$ 33,041		1,150,437
Net increase in goodwill related to current year						33,041		1,150,437
Other Segments
Business Acquisition [Line Items]
Net increase (decrease) in goodwill						2,873		26,994
Net increase in goodwill related to current year						2,873		26,994
International Regulated Waste and Compliance Services
Business Acquisition [Line Items]
Net increase (decrease) in goodwill						4,422		273,519
Net increase in goodwill related to current year						$ 4,422		$ 273,519