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Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Balance as of December 31, 2016	$ 327,333	$ 59,548
Goodwill arising from Acquisition		265,519	$ 46,505
Cumulative translation adjustment	(801)	2,181
Balance as of December 31, 2017	326,735	327,333
TangenX Technology Corporation
Goodwill [Line Items]
Goodwill arising from Acquisition		85
Spectrum Inc.
Goodwill [Line Items]
Goodwill arising from Acquisition	$ 203
Goodwill arising from Acquisition		$ 265,519

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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