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Changes in Carrying Value of Goodwill (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Goodwill [Line Items] |
Balance at December 31, 2016 | $ 59,548
Balance at December 31, 2017 | 327,333
TangenX Technology Corporation |
Goodwill [Line Items] |
Goodwill arising from Acquisition | 85
Spectrum Inc. |
Goodwill [Line Items] |
Goodwill arising from Acquisition | 265,519
Atoll GmbH |
Goodwill [Line Items] |
Foreign currency adjustments on goodwill from the Atoll Acquisition | $ 2,181

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