Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 PPC Broadband Inc [Member]	Dec. 10, 2012 PPC Broadband Inc [Member]	Dec. 31, 2012 Miranda Technologies Inc [Member]	Jul. 27, 2012 Miranda Technologies Inc [Member]	Dec. 31, 2010 GarrettCom [Member]	Dec. 05, 2010 GarrettCom [Member]	Dec. 31, 2011 Thomas & Betts [Member]	Nov. 19, 2010 Thomas & Betts [Member]
Business Acquisition [Line Items]
Cash				$ 7,511		$ 33,324		$ 6,143
Receivables				28,756		27,592		5,126		6,740
Inventories				42,327		31,109		7,428		10,882
Other current assets				480		1,923		1,059		227
Property, plant and equipment				27,752		23,452		523		15,773
Goodwill	439,696	27,891	277,187	277,187	162,764	162,764	24,059	24,059	29,335	29,335
Intangible assets				161,500		159,991
Other intangible assets								19,200		22,900
Other non-current assets				134				2,767
Total assets				545,647		440,155		66,305		85,857
Accounts payable				19,634		23,917		1,176		6,546
Accrued liabilities				3,967		5,591		2,151		1,245
Current deferred tax liabilities						4,839
Current and deferred taxes								6,400
Other long-term liabilities				646		11,835				877
Non-current deferred tax liabilities						19,294
Total liabilities				24,247		65,476		9,727		8,668
Net assets				$ 521,400		$ 374,679		$ 56,578		$ 77,189