Acquisitions (Schedule Of Assets And Liabilities Assumed At Fair Values) (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jul. 22, 2011	Jun. 30, 2011	Jun. 01, 2010
Cash and cash equivalents			$ 1,465,000		$ 1,259,000
Accounts receivable			4,434,000		14,788,000
Inventories			1,062,000		8,139,000
Other current assets			42,000		2,236,000
Current assets			7,003,000		26,422,000
Property, plant and equipment			273,000		8,903,000
Goodwill	79,757,000	56,661,000	79,757,000	(3,902,000)	56,661,000
Intangibles			20,600,000		14,168,000
Other noncurrent assets			1,091,000
Total assets			108,724,000		106,154,000
Accounts payable			5,187,000		1,880,000
Accrued liabilities			206,000		11,389,000
Total current liabilities			5,393,000		28,497,000
Other noncurrent liabilities			1,125,000
Total liabilities			6,518,000		29,433,000
Net assets			$ 102,206,000		$ 76,721,000