The Davey 401KSOP and Employee Stock Ownership Plan (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee Stock Ownership Plan (ESOP), initial shares in ESOP	120,000
Employee Stock Ownership Plan (ESOP), shares adjusted for stock split	46,080,000
Employee Stock Ownership Plan (ESOP), initial value in ESOP	$ 2,700
Defined contribution plan, employer matching contribution, percent of employees' gross pay	2.00%
Defined contribution plan, eligible age	21 years
Defined contribution plan, service requirement for eligibility	1 year
Number of put option periods	2
Duration of put option periods	60 days
Employee Stock Ownership Plan (ESOP), fair value of shares subject to repurchase obligation	$ 1,342	$ 1,833
Company shares held in 401KSOP, fair value	180,201	168,145
Redeemable common shares related to 401KSOP and Employee Stock Ownership Plan (ESOP)	$ 181,543	$ 169,978
Defined contribution plan, tier 1
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Defined contribution plan, employer matching contribution, percent of match	100.00%
Defined contribution plan, tier 2
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Defined contribution plan, employer matching contribution, percent of match	50.00%
Maximum [Member] | Defined contribution plan, tier 1
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Defined contribution plan, employer matching contribution, percent of employees' gross pay	3.00%
Maximum [Member] | Defined contribution plan, tier 2
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Defined contribution plan, employer matching contribution, percent of employees' gross pay	5.00%