| **Goodwill and Acquired Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands** | 9 Months Ended |           |
|-------------------------------------------------------------------------------------------|----------------|-----------|
||
| **Goodwill [Roll Forward]**                                                               |           |      |
| Goodwill at beginning of year                                                             | $ 506,265      |      |
| Acquisitions                                                                              | 7,499          |      |
| Currency translation adjustments                                                          | (7,528)        |      |
| Goodwill at end of period                                                                 | 506,265        | $ 506,236 |
| Engine/Mobile Filtration [Member]                                                         |           |      |
| **Goodwill [Roll Forward]**                                                               |           |      |
| Goodwill at beginning of year                                                             | 207,537        |      |
| Acquisitions                                                                              | 0              |      |
| Currency translation adjustments                                                          | (491)          |      |
| Goodwill at end of period                                                                 | 207,537        | 207,046   |
| Industrial/Environmental Filtration [Member]                                              |           |      |
| **Goodwill [Roll Forward]**                                                               |           |      |
| Goodwill at beginning of year                                                             | 298,728        |      |
| Acquisitions                                                                              | 3,604          |      |
| Currency translation adjustments                                                          | (7,037)        |      |
| Goodwill at end of period                                                                 | 298,728        | 295,295   |
| Corporate [Member]                                                                        |           |      |
| **Goodwill [Roll Forward]**                                                               |           |      |
| Goodwill at beginning of year                                                             | 0              |      |
| Acquisitions                                                                              | 3,895          |      |
| Currency translation adjustments                                                          | 0              |      |
| Goodwill at end of period                                                                 | $ 0            | $ 3,895   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267
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| X                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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