Restructuring - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 119
Material Handling [Member] | Facility Closing [Member]
Restructuring Cost And Reserve [Line Items]
Expected restructuring charges in 2017	$ 7,700		7,700
Restructuring charges in employee severance and other employee-related costs			3,100
Restructuring charges in equipment relocation and facility shut down costs			2,600
Expected restructuring charges in accelerated depreciation charges on property, plant and equipment			2,000
Restructuring charges	0	$ 4,000	100	$ 5,100
Other restructuring associated costs incurred	0	200	0	700
Gains on other asset dispositions	$ 200	$ 600	$ 200	$ 1,200