The unaudited pro forma financial information presented below gives effect to the Clark Pest Control acquisition (Details) - Clark Pest Control [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUES
Customer services	$ 535,993	$ 515,454	$ 997,829	$ 957,373
COSTS AND EXPENSES	449,706	421,442	854,953	800,692
INCOME BEFORE INCOME TAXES	86,287	94,012	142,876	156,681
PROVISION FOR INCOME TAXES	22,489	25,683	34,458	37,032
NET INCOME	$ 63,798	$ 68,329	$ 108,418	$ 119,649
NET INCOME PER SHARE - BASIC AND DILUTED	$ 0.19	$ 0.21	$ 0.33	$ 0.37
DIVIDENDS PAID PER SHARE	$ 0.11	$ 0.09	$ 0.21	$ 0.19
Weighted average participating shares outstanding - basic and diluted	327,506,000	327,282,000	327,506,000	327,263,000