Restructuring - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 5,059,000
Manufacturing Plant Closing [Member]
Restructuring Cost And Reserve [Line Items]
Gain on asset dispositions		$ 600,000	1,300,000
Other restructuring associated costs incurred		200,000	700,000
Manufacturing Plant Closing [Member] | Held for Sale [Member] | Subsequent Event [Member]
Restructuring Cost And Reserve [Line Items]
Impairment of assets classified as held for sale	$ 0
Manufacturing Plant Closing [Member] | Held for Sale [Member] | Other Assets [Member]
Restructuring Cost And Reserve [Line Items]
Assets classified as held for sale		3,400,000	3,400,000
Manufacturing Plant Closing [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges		3,300,000	4,400,000
Headcount Efficiencies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 1,688,000
Headcount Efficiencies [Member] | Cost of Sales [Member] | Scarborough, Ontario, Canada [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges in employee severance and other employee-related costs		$ 700,000
Scenario, Forecast [Member]
Restructuring Cost And Reserve [Line Items]
Expected restructuring charges in 2017				$ 8,700,000
Restructuring charges in employee severance and other employee-related costs				3,600,000
Restructuring charges in equipment relocation and facility shut down costs				2,500,000
Expected restructuring charges in accelerated depreciation charges on property, plant and equipment				2,600,000
Expected restructuring charges in second half of 2017				3,600,000
Scenario, Forecast [Member] | Manufacturing Plant Closing [Member]
Restructuring Cost And Reserve [Line Items]
Expected restructuring charges in second half of 2017				$ 500,000