Acquisitions - Intangible Assets Related to Acquisition (Detail) (PPC Broadband Inc [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 10, 2012
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 132,500
Goodwill	276,987	276,987
Weighted average amortization period	11 years 2 months 12 days
Intangible assets not subject to amortization		164,500
Intangible assets not subject to amortization	308,987
Total intangible assets	441,487
In-process research and development [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	5,000
Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	27,000
Developed technologies [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	76,000
Weighted average amortization period	5 years
Customer relationships [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	55,000
Weighted average amortization period	20 years
Backlog [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 1,500
Weighted average amortization period	6 months