Business Combination - Narrative (Details) $ in Thousands						5 Months Ended	7 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($)	Dec. 01, 2017 USD ($) country	Apr. 04, 2017 USD ($) shares	Nov. 18, 2015	Jul. 31, 2015 USD ($) shares	Dec. 31, 2015 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) country	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Effective period of the repurchase program				1 year
Reduction of contingent liability						$ 23,692		$ 26,948	$ 53,608
Adjustment to additional paid in capital, settlement of Dow liabilities								$ 55,089
Number of operating countries (more than) | country								45
AgroFresh Inc.
Business Acquisition [Line Items]
Cash consideration					$ 635,000
AgroFresh Inc. | Common stock
Business Acquisition [Line Items]
Number of shares issued as consideration (in shares) | shares					17,500,000
Tecnidex Fruit Protection, S.A.U.
Business Acquisition [Line Items]
Cash consideration		$ 20,000
Number of operating countries (more than) | country		18
Percentage of voting interests acquired		75.00%
Dow
Business Acquisition [Line Items]
Outstanding payable								$ 1,200	$ 100
Dow | Amendment agreement
Business Acquisition [Line Items]
Increase (decrease) in due to related parties			$ 20,000					(18,200)
Related party transactions, cash paid			$ 10,000
Reduction of contingent liability								95,100
Deferred tax effect on reduction of contingent liability								40,000
Adjustment to additional paid in capital, settlement of Dow liabilities								55,100
Dow | Working capital adjustment
Business Acquisition [Line Items]
Outstanding payable								17,000
Dow | Value Added Tax reimbursement
Business Acquisition [Line Items]
Outstanding payable								9,300
Dow | Tax receivables agreement
Business Acquisition [Line Items]
Increase (decrease) in due to related parties								(75,300)
Outstanding payable								$ 12,000
Dow Chemical
Business Acquisition [Line Items]
Number of shares authorized to be repurchased (in shares) | shares			5,070,358
Percentage of number of shares outstanding			10.00%
Effective period of the repurchase program			18 months
Dow Chemical | Tax receivables agreement
Business Acquisition [Line Items]
Percentage of tax savings to be paid			50.00%		85.00%
Subsequent event | Dow | Amendment agreement
Business Acquisition [Line Items]
Related party transactions, cash paid	$ 10,000
Level 3 | Tecnidex Fruit Protection, S.A.U.
Business Acquisition [Line Items]
Fair value of contingent consideration		$ 700
Scenario, Forecast | Tecnidex Fruit Protection, S.A.U.
Business Acquisition [Line Items]
Cash consideration							$ 25,000