Goodwill - Allocation of Goodwill by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, gross	$ 1,566,900
Revisions to purchase price allocation	(5,700)
Foreign exchange	900
Goodwill, gross, as of March 31, 2014	1,562,100
Accumulated impairment charges	(116,400)
Goodwill, net	1,445,712	1,450,506
Wireless [Member]
Goodwill [Line Items]
Goodwill, gross	821,100
Foreign exchange	900
Goodwill, gross, as of March 31, 2014	822,000
Accumulated impairment charges	(80,200)
Goodwill, net	741,800
Enterprise [Member]
Goodwill [Line Items]
Goodwill, gross	659,500
Revisions to purchase price allocation	(5,700)
Goodwill, gross, as of March 31, 2014	653,800
Goodwill, net	653,800
Broadband [Member]
Goodwill [Line Items]
Goodwill, gross		86,300
Goodwill, gross, as of March 31, 2014	86,300	86,300
Accumulated impairment charges	(36,200)
Goodwill, net	$ 50,100