Fair Value Measurements - Fair value of Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands				12 Months Ended
		Apr. 04, 2017	Jul. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Contingent consideration | Recurring
Financial instruments measured at fair value on a recurring basis
Total				$ 44,983	$ 153,864
Contingent consideration | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total				456	1,080
Contingent consideration | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total				44,527	152,784
Contingent consideration | Interest rate contract | Recurring
Financial instruments measured at fair value on a recurring basis
Total				456
Contingent consideration | Interest rate contract | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total				0
Contingent consideration | Interest rate contract | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total				456
Contingent consideration | Interest rate contract | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total				0
Contingent consideration | Stock appreciation rights | Recurring
Financial instruments measured at fair value on a recurring basis
Total				268	22
Contingent consideration | Stock appreciation rights | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | Stock appreciation rights | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | Stock appreciation rights | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total				268	22
Contingent consideration | Phantom shares | Recurring
Financial instruments measured at fair value on a recurring basis
Total				186	4
Contingent consideration | Phantom shares | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | Phantom shares | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | Phantom shares | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total				186	4
Contingent consideration | AgroFresh Inc. | Warrant consideration | Recurring
Financial instruments measured at fair value on a recurring basis
Total					1,080
Contingent consideration | AgroFresh Inc. | Warrant consideration | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total					0
Contingent consideration | AgroFresh Inc. | Warrant consideration | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total					1,080
Contingent consideration | AgroFresh Inc. | Warrant consideration | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total					0
Contingent consideration | AgroFresh Inc. | Tax amortization benefit contingency | Recurring
Financial instruments measured at fair value on a recurring basis
Total				43,382	150,260
Contingent consideration | AgroFresh Inc. | Tax amortization benefit contingency | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | AgroFresh Inc. | Tax amortization benefit contingency | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | AgroFresh Inc. | Tax amortization benefit contingency | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total				$ 43,382	150,260
Current portion tax effect rate	[1]			35.30%
Non-current portion new tax effect rate	[1]			21.50%
Contingent consideration | AgroFresh Inc. | Deferred acquisition payment | Recurring
Financial instruments measured at fair value on a recurring basis
Total				$ 691	2,498
Contingent consideration | AgroFresh Inc. | Deferred acquisition payment | Recurring | Level 1
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | AgroFresh Inc. | Deferred acquisition payment | Recurring | Level 2
Financial instruments measured at fair value on a recurring basis
Total				0	0
Contingent consideration | AgroFresh Inc. | Deferred acquisition payment | Recurring | Level 3
Financial instruments measured at fair value on a recurring basis
Total				$ 691	$ 2,498
Period over which earnout is measured	[2]			2 years
Dow Chemical | Tax receivables agreement
Financial instruments measured at fair value on a recurring basis
Percentage of tax savings to be paid		50.00%	85.00%

[1] The fair value of the contingent consideration related to the Tecnidex acquisition.

[2] The derivative assets and liabilities relate to an interest rate derivative that is measured at fair value using observable market inputs such as interest rates, our own credit risks as well as an evaluation of the counterpart's' credit risks.