ACQUISITIONS (Details) customer in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) acquisition customer	Dec. 31, 2016 USD ($) acquisition	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Number of acquisitions | acquisition	23	34
Cash purchase price for acquisitions	$ 130,200	$ 46,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Materials and supplies	14,983	13,724
Equipment and property, net	134,088	133,477
Goodwill	346,514	255,665	$ 249,939
Customer contracts	152,869	117,466
Other intangible assets	61,548	44,310
Current liabilities	$ (294,569)	(276,991)
Northwest Exterminating
Business Acquisition [Line Items]
Number of customers | customer	120
Business acquisitions
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Accounts receivable, net	$ 3,836	3,334
Materials and supplies	312	353
Equipment and property, net	3,027	4,525
Goodwill	87,261	6,468
Customer contracts	60,695	49,365
Other intangible assets	20,086	1,285
Current liabilities	(30,344)	(10,809)
Other assets and liabilities, net	1,209	(594)
Total consideration paid	146,082	53,927
Less: Contingent consideration liability	(15,893)	(7,619)
Total cash purchase price	$ 130,189	$ 46,308