Impairment Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Impairment charges	$ 0		$ 0			$ 544	$ 9,874
Material Handling [Member]
Impairment charges				$ 1,300
Novel [Member]
Impairment charges					$ 8,500
Manufacturing Plant Closing [Member] | Scarborough, Ontario, Canada [Member]
Impairment charges		$ 500
Other Assets [Member] | Manufacturing Plant Closing [Member] | Scarborough, Ontario, Canada [Member] | Level 2 [Member]
Building classified as held for sale, fair value		$ 3,200