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Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Original amount | $ 42,984 | $ 42,984
Accumulated amortization | 24,589 | 20,829
Other intangible assets, net | $ 18,395 | 22,155
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 8 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 20 years |
Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 8 years |
Original amount | $ 17,464 | 17,464
Accumulated amortization | 6,927 | 4,743
Other intangible assets, net | 10,537 | 12,721
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original amount | 25,520 | 25,520
Accumulated amortization | 17,662 | 16,086
Other intangible assets, net | $ 7,858 | $ 9,434
Trademarks and trade names | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 15 years |
Trademarks and trade names | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful lives of intangible assets | 20 years |

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