ACQUISITIONS - Preliminary Purchase Price Allocation and Other Adjustments to Purchase Price Allocations (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Intangibles	$ 23,235
Goodwill	3,596,899	$ 3,758,177	$ 2,418,832
Business Acquisitions in 2016
Business Acquisition [Line Items]
Fixed assets	10,487
Intangibles	23,235
Goodwill	40,336
Accounts receivable	1,574
Net other assets/ (liabilities)	8
Current liabilities	(355)
Net deferred tax liabilities	(1,050)
Total purchase price allocation	74,235
Shred-It Acquisition
Business Acquisition [Line Items]
Fixed assets	40,831
Intangibles	158,940
Goodwill, purchase accounting adjustment	(157,405)
Accounts receivable	(1,085)
Net other assets/ (liabilities)	(65)
Current liabilities	(12,298)
Net deferred tax liabilities	(18,798)
Total purchase price allocation	10,120
Other Prior Year Acquisitions
Business Acquisition [Line Items]
Fixed assets	6,677
Intangibles	19,681
Goodwill, purchase accounting adjustment	(22,849)
Accounts receivable	775
Net other assets/ (liabilities)	148
Current liabilities	(1,342)
Net deferred tax liabilities	(4,854)
Total purchase price allocation	(1,764)
Business Acquisitions in Year 2015
Business Acquisition [Line Items]
Fixed assets	47,508
Intangibles	178,621
Goodwill, purchase accounting adjustment	(180,254)
Accounts receivable	(310)
Net other assets/ (liabilities)	83
Current liabilities	(13,640)
Net deferred tax liabilities	(23,652)
Total purchase price allocation	$ 8,356