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Divestitures - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2018 | Feb. 28, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 24, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Estimated gain (loss) on disposal |  |  | $ (15,074) |  | $ (3,970) |  |
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 |  |  |  |  |  |
Estimated 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 |  |  |  |  |  | $ 17,700 |
Income from operations |  |  |  |  |  | $ 1,600 |
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 |  |  |  |  |
Estimated gain (loss) on disposal |  |  |  | $ 4,300 |  |  |
Net proceeds after adjustments |  | 7,200 |  |  |  |  |
Net assets disposed |  | 2,700 |  |  |  |  |
Transaction-related cost |  | $ 200 |  |  |  |  |
Zhongli [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Estimated gain (loss) on disposal |  |  | (15,100) |  |  |  |
Net assets disposed |  |  | $ 24,497 |  | $ 24,497 |  |
Disposal group, Consideration receivable |  |  |  |  |  |  | $ 3,600
Expected closing period of sales agreement |  |  |  |  | 90 days |  |

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