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Consideration Transferred (Detail) - USD ($) $ in Thousands	Aug. 01, 2017	Dec. 14, 2016	Apr. 01, 2016
Spectrum Inc.
Business Acquisition [Line Items]
Cash consideration	$ 122,932
Equity consideration	247,575
Working capital adjustment	955
Total consideration transferred	$ 371,462
Atoll GmbH
Business Acquisition [Line Items]
Cash consideration, less $74 of working capital adjustments			$ 10,176
Equity consideration			14,138
Working capital adjustment			74
Estimated fair value of contingent consideration			952
Total consideration transferred			$ 25,266
TangenX Technology Corporation
Business Acquisition [Line Items]
Cash consideration		$ 37,532
Working capital adjustment		(382)
Total consideration transferred		$ 37,150

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