Restructuring - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Position	Sep. 30, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring charges				$ 865,000	$ 119,000
Net proceeds from sale of facility				7,400,000
SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges				$ 865,000	0
Ameri-Kart [Member]
Restructuring Cost And Reserve [Line Items]
Elimination of positions | Position				30
Expected restructuring charges		$ 900,000		$ 900,000
Restructuring charges		0		0
Additional expected restructuring charges		100,000		100,000
Ameri-Kart [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Other restructuring associated costs incurred		100,000		100,000
Distribution Transformation Plan [Member]
Restructuring Cost And Reserve [Line Items]
Expected restructuring charges		900,000		900,000
Total restructuring costs incurred				900,000
Additional expected restructuring charges		0		0
Distribution Transformation Plan [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Other restructuring associated costs incurred		0		200,000
Material Handling [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges				0	119,000
Material Handling [Member] | Equipment Relocation and Facility Shut Down Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 0	0	100,000
Total restructuring costs incurred				7,700,000
Restructuring charges in employee severance and other employee-related costs				3,100,000
Restructuring charges in equipment relocation and facility shut down costs				2,600,000
Restructuring charges in accelerated depreciation charges on property, plant and equipment				2,000,000
Impairment charges		$ 900,000
Net proceeds from sale of facility	$ 2,900,000
Material Handling [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges				$ 0	$ 0