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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum     5.00%  
Share-based compensation arrangement by share-based payment award, percentage of outstanding and available for grant, maximum     10.00%  
Compensation expense, share-based payment plans $ 858 $ 655 $ 2,567 $ 2,184
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Volatility rate     9.70% 9.90%
Risk-free interest rate     0.70% 2.30%
Expected dividend yield     0.40% 0.70%
Expected life of awards (years)     8 years 1 month 6 days 8 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Exercisable, ending balance 1,028,683   1,028,683  
Stock option plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense, share-based payment plans     $ 398 $ 444
Stock options awarded, term (years)     10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding, beginning balance     1,428,082  
Granted     174,897  
Exercised     (83,769)  
Forfeited     (21,645)  
Outstanding, ending balance 1,497,565   1,497,565  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Outstanding, weighted average exercise price, beginning balance     $ 15.13  
Granted, weighted average exercise price     24.20  
Exercised, weighted average exercise price     10.94  
Forfeited, weighted average exercise price     19.15  
Outstanding, weighted average exercise price, ending balance $ 16.36   16.36  
Exercisable, weighted average exercise price, ending balance $ 14.26   $ 14.26  
Outstanding, weighted average remaining contractual life (years)     5 years 7 months 6 days  
Exercisable, weighted average remaining contractual life (years)     4 years 4 months 24 days  
Outstanding, aggregate intrinsic value $ 12,789   $ 12,789  
Exercisable, aggregate intrinsic value 10,940   10,940  
Outstanding, unrecognized compensation cost $ 1,426   $ 1,426  
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition     2 years 9 months 18 days  
Stock-settled stock appreciation rights (SSARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense, share-based payment plans     $ 214 269
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Unvested, beginning balance     262,705  
Granted     0  
Forfeited     (2,254)  
Vested     (119,255)  
Unvested, ending balance 141,196   141,196  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, beginning balance     $ 3.47  
Granted, weighted average award date value     0  
Forfeited, weighted average award date value     3.53  
Vested, weighted average award date value     3.32  
Unvested, weighted average award date value, ending balance $ 3.60   $ 3.60  
Weighted average remaining contractual life (years)     1 year 1 month 6 days  
Unrecognized compensation cost $ 309   $ 309  
Aggregate intrinsic value $ 3,516   3,516  
Restricted stock units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense, share-based payment plans     $ 888 605
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Unvested, beginning balance     224,259  
Granted     98,863  
Forfeited     (1,871)  
Vested     (65,944)  
Unvested, ending balance 255,307   255,307  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, beginning balance     $ 17.11  
Granted, weighted average award date value     23.74  
Forfeited, weighted average award date value     17.37  
Vested, weighted average award date value     15.52  
Unvested, weighted average award date value, ending balance $ 20.09   $ 20.09  
Weighted average remaining contractual life (years)     2 years 8 months 12 days  
Unrecognized compensation cost $ 3,056   $ 3,056  
Aggregate intrinsic value $ 6,357   $ 6,357  
Employee PRSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Granted     86,959  
Unvested, ending balance 220,157   220,157  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, ending balance $ 19.92   $ 19.92  
Weighted average remaining contractual life (years)     3 years  
Unrecognized compensation cost $ 2,622   $ 2,622  
Aggregate intrinsic value $ 5,482   $ 5,482  
Nonemployee Director RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Granted     11,904  
Unvested, ending balance 35,150   35,150  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, ending balance $ 21.14   $ 21.14  
Weighted average remaining contractual life (years)     1 year 7 months 6 days  
Unrecognized compensation cost $ 434   $ 434  
Aggregate intrinsic value $ 875   875  
The Davey Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense, share-based payment plans     $ 1,067 $ 866
Employee stock purchase plan, service period     1 year  
Employee stock purchase plan, percentage of market price, purchase date     85.00%  
Employee stock purchase plan, discount from market price, purchase date     15.00%