Business Acquisitions and License Agreement - Summary of Identifiable Intangible Assets Acquired and Estimated Useful Lives (Detail) (Broadcom 10/40/100Gb Ethernet Business [Member], USD $) In Thousands, unless otherwise specified	1 Months Ended
	Mar. 30, 2014
Business Acquisition [Line Items]
Total	$ 85,360
Nonrecurring [Member] | Level 3 [Member]
Business Acquisition [Line Items]
In-process research and development	21,200
Total	85,360
Developed Technology [Member] | Nonrecurring [Member] | Level 3 [Member]
Business Acquisition [Line Items]
Identifiable intangible Assets, Weighted Average Useful Lives (Years)	5 years
Intangible Assets	58,760
Customer Relationships [Member] | Nonrecurring [Member] | Level 3 [Member]
Business Acquisition [Line Items]
Identifiable intangible Assets, Weighted Average Useful Lives (Years)	8 years
Intangible Assets	$ 5,400