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Segment and Geographic Information - Summary of net sales by the countries and property, plant and equipment, net of accumulated depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues [Abstract]      
Revenues $ 144,568 $ 150,000 $ 158,406
Interest Expense [Abstract]      
Interest expense 2,614 2,794 2,695
Investment Income, Net [Abstract]      
Interest income 1,036 311
Depreciation [Abstract]      
Depreciation 7,366 7,027 7,659
Gross Profit [Abstract]      
Gross Profit (7,345) 9,317 13,973
Property, Plant and Equipment [Abstract]      
Property, plant and equipment, net 63,158 72,188  
Assets [Abstract]      
Assets 183,408 141,448  
Corporate [Member]      
Investment Income, Net [Abstract]      
Interest income 1,036 311  
United States [Member]      
Property, Plant and Equipment [Abstract]      
Property, plant and equipment, net 41,656 42,886  
Assets [Abstract]      
Assets 88,395 79,126  
United States [Member] | Produce Business [Member]      
Revenues [Abstract]      
Revenues 120,745 124,699 132,464
Interest Expense [Abstract]      
Interest expense 36 37 31
Depreciation [Abstract]      
Depreciation 4,545 4,591 5,056
Gross Profit [Abstract]      
Gross Profit (14,153) 494 5,931
Canada [Member]      
Property, Plant and Equipment [Abstract]      
Property, plant and equipment, net 18,759 25,933  
Assets [Abstract]      
Assets 92,067 58,690  
Canada [Member] | Produce Business [Member]      
Revenues [Abstract]      
Revenues 22,674 23,355 24,020
Interest Expense [Abstract]      
Interest expense 2,507 2,668 2,563
Depreciation [Abstract]      
Depreciation 1,917 1,564 1,807
Gross Profit [Abstract]      
Gross Profit 7,486 8,659 7,946
Canada [Member] | Energy Business [Member]      
Interest Expense [Abstract]      
Interest expense 71 89 101
Depreciation [Abstract]      
Depreciation 904 872 796
Gross Profit [Abstract]      
Gross Profit (678) 164 96
Energy - Canada [Member]      
Property, Plant and Equipment [Abstract]      
Property, plant and equipment, net 2,743 3,369  
Assets [Abstract]      
Assets 2,946 3,632  
Energy - Canada [Member] | Energy Business [Member]      
Revenues [Abstract]      
Revenues $ 1,149 $ 1,946 $ 1,922