Acquisitions - Intangible Assets Related to Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
PPC Broadband Inc [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 132,500
Intangible assets not subject to amortization	309,091
Total intangible assets	441,591
Weighted average amortization period	11 years 2 months 12 days
PPC Broadband Inc [Member] | Goodwill [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	277,091
PPC Broadband Inc [Member] | In-process research and development [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	5,000
PPC Broadband Inc [Member] | Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	27,000
PPC Broadband Inc [Member] | Developed technologies [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	76,000
Amortization period	5 years
PPC Broadband Inc [Member] | Customer relationships [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	55,000
Amortization period	20 years
PPC Broadband Inc [Member] | Backlog [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	1,500
Amortization period	6 months
Miranda Technologies Inc [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	117,524
Intangible assets not subject to amortization	203,673
Total intangible assets	321,197
Weighted average amortization period	9 years 10 months 24 days
Miranda Technologies Inc [Member] | Goodwill [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	161,206
Miranda Technologies Inc [Member] | In-process research and development [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	6,913
Miranda Technologies Inc [Member] | Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	35,554
Miranda Technologies Inc [Member] | Developed technologies [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	69,132
Amortization period	4 years
Miranda Technologies Inc [Member] | Customer relationships [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	44,442
Amortization period	20 years
Miranda Technologies Inc [Member] | Backlog [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 3,950
Amortization period	1 year