Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ 1,693,481	$ 1,511,081	$ 1,378,053
Contract with customer, asset and liability [Abstract]
Revenue recognized	2,266	1,997
Contract liabilities - current	3,430	3,723
Contract liabilities - noncurrent	3,700	4,145
Net contract liabilities	7,130	7,868
Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	934,977	840,553	765,072
Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	754,455	666,972	610,666
All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	4,049	3,556	2,315
United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	1,594,546	1,426,019	1,292,496
United States \| Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	881,428	800,590	723,577
United States \| Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	709,069	621,873	566,604
United States \| All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	4,049	3,556	2,315
Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	98,935	85,062	85,557
Canada \| Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	53,549	39,963	41,495
Canada \| Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	45,386	45,099	44,062
Canada \| All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0
Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	973,974	928,022	888,884
Tree and plant care \| Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	563,222	545,048	530,632
Tree and plant care \| Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	411,508	383,148	358,589
Tree and plant care \| All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	(756)	(174)	(337)
Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	185,994	169,948	155,543
Grounds maintenance \| Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0
Grounds maintenance \| Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	185,994	169,948	155,543
Grounds maintenance \| All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0
Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	25,172	31,102	23,453
Storm damage services \| Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	12,049	21,437	16,763
Storm damage services \| Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	13,123	9,665	6,690
Storm damage services \| All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0
Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	508,341	382,009	310,173
Consulting and other \| Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	359,706	274,068	217,677
Consulting and other \| Residential and Commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	143,830	104,211	89,844
Consulting and other \| All Other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ 4,805	$ 3,730	$ 2,652

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