Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Net revenue	$ 690,940	$ 624,900	$ 2,021,704	$ 1,890,641
Roto-Rooter [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	239,907	226,478	722,141	706,332
Implicit price concessions and credit memos	(6,370)	(9,319)	(21,199)	(27,032)
Net revenue	233,537	217,159	700,942	679,300
Roto-Rooter [Member] \| Short-Term Core [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	168,321	158,529	508,615	486,078
Roto-Rooter [Member] \| Drain cleaning [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	58,475	55,454	175,710	170,553
Roto-Rooter [Member] \| Plumbing [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	48,242	45,753	145,727	137,097
Roto-Rooter [Member] \| Excavation [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	61,249	57,102	186,322	177,833
Roto-Rooter [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	355	220	856	595
Roto-Rooter [Member] \| Water Restoration [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	48,882	45,196	143,587	149,183
Roto-Rooter [Member] \| Independent Contractors [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	16,867	16,871	51,751	52,682
Roto-Rooter [Member] \| Franchisee Fees [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	1,575	1,433	4,539	4,262
Roto-Rooter [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Gross revenue	$ 4,262	$ 4,449	$ 13,649	$ 14,127