Business Combinations (Schedule of Allocation of Purchase Price to the Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2010
Business Acquisition [Line Items]
Cash and cash equivalents	$ 106
Trade receivables	7,729
Inventory	2,348
Prepaid expenses and other current assets	700
Property and equipment	682
Goodwill	31,739
Intangible assets	43,200
Other assets	29
Total assets acquired	86,533
Accounts payable	501
Accrued expenses	5,115
Long-term liabilities, including contingent consideration	7,600
Net assets acquired	$ 73,317