Divestitures - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended			6 Months Ended
	Nov. 27, 2018	Mar. 30, 2018	Feb. 28, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (loss) on disposal					$ (73)		$ (70)	$ 11,104
Gain (loss) on disposal					(73)		(70)	11,104
Net sales				$ 81,179	81,089		$ 167,190	155,229
Strobic Air Corporation [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale price, subject to post-closing purchase price adjustments		$ 28,500
Gain (loss) on disposal						$ 6,900
Net proceeds after adjustments		27,900
Net assets disposed		18,800
Transaction-related cost		2,200
Goodwill		13,000
Net sales						4,200
Income from operations						1,100
Gain (loss) on disposal						6,900
Strobic Air Corporation [Member] | Definite-Lived Intangible Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets		2,300
Strobic Air Corporation [Member] | Indefinite-Lived Intangible Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets		$ 1,200
Keystone Filter [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale price, subject to post-closing purchase price adjustments			$ 7,500
Gain (loss) on disposal						4,300
Net proceeds after adjustments			7,200
Net assets disposed			2,700
Transaction-related cost			$ 200
Gain (loss) on disposal						$ 4,300
Zhongli [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (loss) on disposal	$ (15,100)
Gain (loss) on disposal	(15,100)
Disposal group, consideration receivable	$ 3,600
Net sales					$ 1,200			$ 2,900