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Litigation and Environmental - Additional Information (Detail) $ in Thousands					1 Months Ended		12 Months Ended
	Nov. 10, 2016 USD ($)	Mar. 29, 2016 Case	Apr. 07, 2014 Case	May 31, 2012 Case Plaintiff Person	Dec. 31, 2017 Case	Jan. 31, 2017 USD ($) Case	Dec. 31, 2017 USD ($) Case Plaintiff
United States Lawsuits
Loss Contingencies [Line Items]
Number of lawsuits							3
Legal costs and fees | $	$ 2,350
U.S. State District Court Abad Castillo And Marquinez
Loss Contingencies [Line Items]
Number of Lawsuits Filed				2
Number of claimants | Person				2,700
U.S. State District Court Abad Castillo | Hendler Law Firm
Loss Contingencies [Line Items]
Number of plaintiffs required to be dismissed | Plaintiff				22
Number of plaintiffs dismissed				14
Superior Court Abad Castillo And Marquinez
Loss Contingencies [Line Items]
Number of Lawsuits Filed				57
Harold Reed v. AMVAC et al.
Loss Contingencies [Line Items]
Number of lawsuits filed		2
Reed
Loss Contingencies [Line Items]
Loss contingency damages sought, value | $						$ 250
Jem Holdings
Loss Contingencies [Line Items]
Loss contingency damages sought, value | $						$ 60
Cross Claims
Loss Contingencies [Line Items]
Number of lawsuits filed						4
Van Giessen Growers, Inc.
Loss Contingencies [Line Items]
Loss contingency estimate of possible loss | $						$ 400
Chin Coulee Farms
Loss Contingencies [Line Items]
Loss contingency estimate of possible loss | $						530
Houweling Farms
Loss Contingencies [Line Items]
Loss contingency estimate of possible loss | $						$ 4,300
Galvan Matter
Loss Contingencies [Line Items]
Number of lawsuits filed					1
Number of claims granted			7
Nicaraguan
Loss Contingencies [Line Items]
Number of claimants | Plaintiff							3,592
Nicaraguan | Special Law
Loss Contingencies [Line Items]
Number of lawsuits filed							2
Number of claimants | Plaintiff							57
Nicaraguan | Public Law
Loss Contingencies [Line Items]
Number of lawsuits filed							85
Nicaraguan | Compensatory Damages
Loss Contingencies [Line Items]
Value of claims paid | $							$ 1,000
Nicaraguan | Punitive Damages
Loss Contingencies [Line Items]
Value of claims paid | $							$ 5,000

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