Components of Assets and Liabilities of Each Business (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net	$ 7,687	$ 11,320
Inventories	12,103	14,271
Other assets	1,379	2,616
Property, plant and equipment	6,227	7,456
Assets of discontinued operations	27,396	35,663
Accounts payable, accrued expenses and other current liabilities	6,869	8,861
Deferred revenue	2,017	5,061
Other liabilities	802	884
Liabilities of discontinued operations	$ 9,688	$ 14,806