Other Income (Loss), Net - Schedule of Other Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Long Lived Assets Held-for-sale [Line Items]
Interest income	$ 2,827	$ 1,525	$ 1,822
Gain on asset dispositions, net	593	1,724	2,094
Other, net	710	836	(1,101)
Disposal of non-core product lines	0	(4,223)	0
Impairment of intangible assets	0	(723)	0
Land impairment loss	0	0	(50)
Total other income (loss), net	4,130	(861)	$ 2,765
Safety Works
Long Lived Assets Held-for-sale [Line Items]
Impairment of intangible assets	(700)
Property in Australia
Long Lived Assets Held-for-sale [Line Items]
Gain on asset dispositions, net	2,000
Detector Tube Assets
Long Lived Assets Held-for-sale [Line Items]
Gain on asset dispositions, net		$ 2,200
Americas | Safety Works
Long Lived Assets Held-for-sale [Line Items]
Disposal of non-core product lines	$ (4,200)