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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUES
Customer services	$ 556,466	$ 523,957	$ 1,554,295	$ 1,481,329
COSTS AND EXPENSES	510,327	430,970	1,365,280	1,231,662
INCOME BEFORE INCOME TAXES	46,139	92,987	189,015	249,667
PROVISION FOR INCOME TAXES	2,078	23,262	36,569	58,566
NET INCOME	$ 44,061	$ 69,725	$ 152,446	$ 191,101
NET INCOME PER SHARE - BASIC AND DILUTED	$ 0.13	$ 0.21	$ 0.47	$ 0.58
DIVIDENDS PAID PER SHARE	$ 0.11	$ 0.09	$ 0.32	$ 0.28
Weighted average participating shares outstanding - basic and diluted	327,459,000	327,320,000	327,490,000	327,283,000