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Acquisition of Silanis - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Nov. 25, 2015	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Provision for income taxes		$ 1,386	$ 2,223
Silanis Technology Inc [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 75,000
Unused investment tax credits		340
Future tax benefit of foreign net operating loss carryforwards		7,004
Future tax benefits of research and development expenses and other carryforwards		4,217
Valuation allowance		2,415
Decrease in valuation allowance		9,146
Deferred tax assets		9,146
Provision for income taxes		311
Purchase price allocation to identifiable intangible assets		$ 30,000

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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