Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of revenue [Line Items]
Revenue from contract with customer	$ 319,247	$ 301,434	$ 607,527	$ 549,323
United States
Disaggregation of revenue [Line Items]
Revenue from contract with customer	301,760	280,410	574,477	511,316
Canada
Disaggregation of revenue [Line Items]
Revenue from contract with customer	17,487	21,024	33,050	38,007
Tree and plant care [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	215,025	199,280	417,000	363,082
Grounds maintenance [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	40,991	45,657	64,054	73,599
Storm damage services [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	1,843	1,140	3,004	3,837
Consulting and other [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	61,388	55,357	123,469	108,805
Utility [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	176,735	151,192	362,484	291,661
Utility [Member] | United States
Disaggregation of revenue [Line Items]
Revenue from contract with customer	168,479	140,701	345,566	270,583
Utility [Member] | Canada
Disaggregation of revenue [Line Items]
Revenue from contract with customer	8,256	10,491	16,918	21,078
Utility [Member] | Tree and plant care [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	131,607	112,823	273,350	216,209
Utility [Member] | Grounds maintenance [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Utility [Member] | Storm damage services [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	502	152	1,026	1,224
Utility [Member] | Consulting and other [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	44,626	38,217	88,108	74,228
Residential commercial [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	142,905	149,970	244,858	257,365
Residential commercial [Member] | United States
Disaggregation of revenue [Line Items]
Revenue from contract with customer	133,674	139,437	228,726	240,436
Residential commercial [Member] | Canada
Disaggregation of revenue [Line Items]
Revenue from contract with customer	9,231	10,533	16,132	16,929
Residential commercial [Member] | Tree and plant care [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	83,504	86,450	143,761	146,877
Residential commercial [Member] | Grounds maintenance [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	40,991	45,657	64,054	73,599
Residential commercial [Member] | Storm damage services [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	1,341	988	1,978	2,613
Residential commercial [Member] | Consulting and other [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	17,069	16,875	35,065	34,276
All other [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	(393)	272	185	297
All other [Member] | United States
Disaggregation of revenue [Line Items]
Revenue from contract with customer	(393)	272	185	297
All other [Member] | Canada
Disaggregation of revenue [Line Items]
Revenue from contract with customer	0	0	0	0
All other [Member] | Tree and plant care [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	(86)	7	(111)	(4)
All other [Member] | Grounds maintenance [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	0	0	0	0
All other [Member] | Storm damage services [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	0	0	0	0
All other [Member] | Consulting and other [Member]
Disaggregation of revenue [Line Items]
Revenue from contract with customer	$ (307)	$ 265	$ 296	$ 301