| **Business Acquisitions and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |
|----------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Increase (Decrease) in Stockholders Equity and Temporary Equity [Roll Forward]**                                   |           |           |   |   |
| Noncontrolling interests (loss) earnings                                                                             | $ 35           | $ 64           | $ 79 | $ 168 |
| Purchase of noncontrolling interests                                                                                 |           |           | 0 | (1,239) |
| Redeemable noncontrolling interests [Member]                                                                         |           |           |   |   |
| **Increase (Decrease) in Stockholders Equity and Temporary Equity [Roll Forward]**                                   |           |           |   |   |
| Redeemable noncontrolling interests, beginning of period                                                             |           |           | 0 | 1,587 |
| Noncontrolling interests (loss) earnings                                                                             |           |           | 0 | (19) |
| Purchase of noncontrolling interests                                                                                 |           |           | 0 | (1,432) |
| Foreign currency translation                                                                                         |           |           | 0 | (136) |
| Dividend                                                                                                             |           |           | 0 | 0 |
| Redeemable noncontrolling interests, end of period                                                                   | 0              | 0              | 0 | 0 |
| Non-redeemable noncontrolling interests [Member]                                                                     |           |           |   |   |
| **Increase (Decrease) in Stockholders Equity and Temporary Equity [Roll Forward]**                                   |           |           |   |   |
| Redeemable noncontrolling interests, beginning of period                                                             |           |           | 896 | 1,043 |
| Noncontrolling interests (loss) earnings                                                                             |           |           | 79 | 187 |
| Purchase of noncontrolling interests                                                                                 |           |           | 0 | 0 |
| Foreign currency translation                                                                                         |           |           | (84) | (192) |
| Dividend                                                                                                             |           |           | (172) | (206) |
| Redeemable noncontrolling interests, end of period                                                                   | $ 719          | $ 832          | $ 719 | $ 832 |

| X                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase (Decrease) in Stockholders Equity and Temporary Equity [Roll Forward]
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of Net Income (Loss) attributable to noncontrolling interest.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.
+ References
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| X                                                                                                                                                                                       |
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