SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Franchising Program (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) franchise	Dec. 31, 2016 USD ($) franchise	Dec. 31, 2015 USD ($) franchise
Franchisor Disclosure [Line Items]
Notes receivable from franchises, maximum period	5 years
Deferred franchise fees	$ 3.4	$ 3.0	$ 2.9
Revenue from franchises	5.4	5.1	4.9
Maximum exposure to loss relating to the franchises	2.5	2.0	$ 1.5
Orkin franchises
Franchisor Disclosure [Line Items]
Notes receivable from franchises	$ 5.9	$ 5.0
Critter Control
Franchisor Disclosure [Line Items]
Number of franchises | franchise	89	94
Notes receivable from franchises	$ 0.2	$ 0.3
United States
Franchisor Disclosure [Line Items]
Number of franchises | franchise	47	50	51
International
Franchisor Disclosure [Line Items]
Number of franchises | franchise	81	70	48