The Davey 401KSOP and Employee Stock Ownership Plan (Notes)	6 Months Ended
Jun. 30, 2018
The Davey 401KSOP and Employee Stock Ownership Plan [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	The Davey 401KSOP and Employee Stock Ownership Plan On March 15, 1979, the Company consummated a plan, which transferred control of the Company to its employees. As a part of this plan, the Company initially sold 120,000 common shares (presently, 23,040,000 common shares adjusted for stock splits) to its Employee Stock Ownership Trust (“ESOT”) for $2,700. The Employee Stock Ownership Plan (“ESOP”), in conjunction with the related ESOT, provided for the grant to certain employees of ownership rights in, but not possession of, the common shares held by the trustee of the ESOT. Annual allocations of shares have been made to individual accounts established for the benefit of the participants. Defined Contribution and Savings Plans--Most employees are eligible to participate in The Davey 401KSOP and ESOP Plan. Effective January 1, 1997, the plan commenced operations and retained the existing ESOP participant accounts and incorporated a deferred savings plan (a “401(k) plan”) feature. Participants in the 401(k) plan are allowed to make before-tax contributions, within Internal Revenue Service established limits, through payroll deductions. Effective January 1, 2009 we match, in either cash or our common shares, 100% of the first one percent and 50% of the next three percent of each participant's before-tax contribution, limited to the first four P. The Davey 401KSOP and Employee Stock Ownership Plan (continued) percent of the employee’s compensation deferred each year. All nonbargaining domestic employees who attained age 21 and completed one year of service are eligible to participate. Our common shares are not listed or traded on an established public trading market, and market prices are, therefore, not available. Semiannually, an independent stock valuation firm determines the fair market value of our common shares based upon our performance and financial condition. The Davey 401KSOP and ESOP Plan includes a put option for shares of the Company’s common stock distributed from the plan. Shares are distributed from the Davey 401KSOP and ESOP Plan to former participants of the plan, their beneficiaries, donees or heirs (each, a “participant”). Since our common stock is not currently traded on an established securities market, if the owners of distributed shares desire to sell their shares, the Company is required to purchase the shares at fair value for two 60-day periods after distribution of the shares from the Davey 401KSOP and ESOP. The fair value of distributed shares subject to the put option totaled $5,677 and $3,843 as of June 30, 2018 and December 31, 2017, respectively. The fair value of the shares held in the Davey 401KSOP and ESOP totaled $115,848 and $119,677 as of June 30, 2018 and December 31, 2017, respectively. Due to the Company’s obligation under the put option, the distributed shares subject to the put option and the shares held in the Davey 401KSOP and ESOP (collectively referred to as 401KSOP and ESOP related shares) are recorded at fair value, classified as temporary equity in the mezzanine section of the consolidated balance sheets and totaled $121,525 and $123,520 as of June 30, 2018 and December 31, 2017, respectively. Changes in the fair value of the 401KSOP and ESOP Plan related shares are reflected in retained earnings while net share activity associated with 401KSOP and ESOP Plan related shares are first reflected in additional paid-in capital and then retained earnings if additional paid-in capital is insufficient.

The Davey 401KSOP and Employee Stock Ownership Plan

On March 15, 1979, the Company consummated a plan, which transferred control of the Company to its employees. As a part of this plan, the Company initially sold 120,000 common shares (presently, 23,040,000 common shares adjusted for stock splits) to its Employee Stock Ownership Trust (“ESOT”) for $2,700. The Employee Stock Ownership Plan (“ESOP”), in conjunction with the related ESOT, provided for the grant to certain employees of ownership rights in, but not possession of, the common shares held by the trustee of the ESOT. Annual allocations of shares have been made to individual accounts established for the benefit of the participants.

Defined Contribution and Savings Plans--Most employees are eligible to participate in The Davey 401KSOP and ESOP Plan. Effective January 1, 1997, the plan commenced operations and retained the existing ESOP participant accounts and incorporated a deferred savings plan (a “401(k) plan”) feature. Participants in the 401(k) plan are allowed to make before-tax contributions, within Internal Revenue Service established limits, through payroll deductions. Effective January 1, 2009 we match, in either cash or our common shares, 100% of the first one percent and 50% of the next three percent of each participant's before-tax contribution, limited to the first four

P. The Davey 401KSOP and Employee Stock Ownership Plan (continued)

percent of the employee’s compensation deferred each year. All nonbargaining domestic employees who attained age 21 and completed one year of service are eligible to participate.

Our common shares are not listed or traded on an established public trading market, and market prices are, therefore, not available. Semiannually, an independent stock valuation firm determines the fair market value of our common shares based upon our performance and financial condition. The Davey 401KSOP and ESOP Plan includes a put option for shares of the Company’s common stock distributed from the plan. Shares are distributed from the Davey 401KSOP and ESOP Plan to former participants of the plan, their beneficiaries, donees or heirs (each, a “participant”). Since our common stock is not currently traded on an established securities market, if the owners of distributed shares desire to sell their shares, the Company is required to purchase the shares at fair value for two 60-day periods after distribution of the shares from the Davey 401KSOP and ESOP. The fair value of distributed shares subject to the put option totaled $5,677 and $3,843 as of June 30, 2018 and December 31, 2017, respectively. The fair value of the shares held in the Davey 401KSOP and ESOP totaled $115,848 and $119,677 as of June 30, 2018 and December 31, 2017, respectively. Due to the Company’s obligation under the put option, the distributed shares subject to the put option and the shares held in the Davey 401KSOP and ESOP (collectively referred to as 401KSOP and ESOP related shares) are recorded at fair value, classified as temporary equity in the mezzanine section of the consolidated balance sheets and totaled $121,525 and $123,520 as of June 30, 2018 and December 31, 2017, respectively. Changes in the fair value of the 401KSOP and ESOP Plan related shares are reflected in retained earnings while net share activity associated with 401KSOP and ESOP Plan related shares are first reflected in additional paid-in capital and then retained earnings if additional paid-in capital is insufficient.