Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 10, 2012 PPC Broadband Inc [Member]	Jul. 27, 2013 Miranda Technologies Inc [Member]
Business Acquisition [Line Items]
Cash				$ 6,874	$ 33,324
Receivables				26,612	27,592
Inventories				45,465	31,109
Other current assets				868	1,924
Property, plant and equipment				26,856	23,930
Goodwill	773,048	778,708	336,591	277,091	161,206
Intangible assets				164,500	159,991
Other non-current assets				1,308
Total assets				549,574	439,076
Accounts payable				22,499	23,917
Accrued liabilities				4,104	5,730
Current deferred tax liabilities					844
Other long-term liabilities				579	8,699
Non-current deferred tax liabilities					25,207
Total liabilities				27,182	64,397
Net assets				$ 522,392	$ 374,679