Organization, Presentation, and Nature of the Business - (Details) gal in Millions	12 Months Ended
	Dec. 31, 2021 facility gal	Dec. 30, 2021 fuel_distribution_location	Aug. 31, 2019 gal
Class of Stock [Line Items]
Number of biorefineries	11
Number of operating biodiesel production facilities	11
Production capacity per year | gal	470
Number of multi-feedstock capable plants	10
REG New Boston
Class of Stock [Line Items]
Production capacity per year | gal			35
North America
Class of Stock [Line Items]
Number of biorefineries	9
Europe
Class of Stock [Line Items]
Number of biorefineries	2
Amber Resources
Class of Stock [Line Items]
Number of fuel distribution locations | fuel_distribution_location		8
Number of cardlock locations | fuel_distribution_location		3