| **Significant Accounting Policies - Reconciliation of Product Warranty Liability (Detail) - USD ($) $ in Thousands** | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------|-----------------|
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| **Accounting Policies [Abstract]**                                                                                   |            |   |
| Balance at beginning of year                                                                                         | $ 11,006        | $ 12,195 |
| Accruals for warranties                                                                                              | 11,662          | 9,670 |
| Warranty payments                                                                                                    | (12,330)        | (10,881) |
| Currency adjustments                                                                                                 | 212             | 22 |
| Balance at end of year                                                                                               | $ 10,550        | $ 11,006 |

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| - References
No definition available.
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| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in the standard and extended product warranty accrual from warranties issued.
+ References
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| - Definition
Amount of foreign currency translation gain (loss) which decreases (increases) the standard and extended product warranty accrual.
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