Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ 450,634	$ 398,945	$ 1,267,174	$ 1,143,548
United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	419,493	376,343	1,190,415	1,079,037
Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	31,141	22,602	76,759	64,511
Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	257,410	243,192	734,915	714,842
Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	50,603	46,056	138,451	128,114
Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	9,432	9,568	23,786	16,298
Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	133,189	100,129	370,022	284,294
Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	247,478	217,305	700,378	637,900
Utility | United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	229,046	207,004	658,021	608,411
Utility | Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	18,432	10,301	42,357	29,489
Utility | Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	147,125	138,112	425,701	420,791
Utility | Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Utility | Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	5,192	7,004	11,340	10,136
Utility | Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	95,161	72,189	263,337	206,973
Residential and commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	201,753	180,706	563,942	504,064
Residential and commercial | United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	189,044	168,405	529,540	469,042
Residential and commercial | Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	12,709	12,301	34,402	35,022
Residential and commercial | Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	110,487	105,108	309,558	294,206
Residential and commercial | Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	50,603	46,056	138,451	128,114
Residential and commercial | Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	4,240	2,564	12,446	6,162
Residential and commercial | Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	36,423	26,978	103,487	75,582
All other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	1,403	934	2,854	1,584
All other | United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	1,403	934	2,854	1,584
All other | Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other | Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	(202)	(28)	(344)	(155)
All other | Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other | Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other | Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ 1,605	$ 962	$ 3,198	$ 1,739