Acquisitions - Intangible Assets Related to Acquisition (Detail) (USD $) In Thousands, unless otherwise specified			0 Months Ended				0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended
	Jun. 29, 2014	Dec. 31, 2013	Mar. 31, 2014 Grass Valley [Member]	Mar. 31, 2014 Grass Valley [Member]	Mar. 31, 2014 Grass Valley [Member] Trademarks [Member]	Mar. 31, 2014 Grass Valley [Member] In-process research and development [Member]	Mar. 31, 2014 Grass Valley [Member] Customer relationships [Member]	Mar. 31, 2014 Grass Valley [Member] Customer relationships [Member]	Mar. 31, 2014 Grass Valley [Member] Developed technologies [Member]	Mar. 31, 2014 Grass Valley [Member] Developed technologies [Member]	Mar. 31, 2014 Grass Valley [Member] Backlog [Member]	Mar. 31, 2014 Grass Valley [Member] Backlog [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Trademarks [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Customer relationships [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Developed technologies [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Backlog [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization				$ 65,500				$ 27,000		$ 37,000		$ 1,500	$ 32,400		$ 22,000	$ 10,000	$ 400
Goodwill	934,285	773,048		106,176									55,281
Intangible assets not subject to amortization				136,176	22,000	8,000							60,281	5,000
Total intangible assets				$ 201,676									$ 92,681
Weighted average amortization period			9 years				15 years		5 years		3 months 18 days		8 years		10 years	4 years	3 months 18 days