Components of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net.	$ 2,981	$ 11,320
Inventories.	8,231	14,271
Other assets.	694	2,616
Property, plant and equipment, net.	5,712	7,456
Assets of discontinued operations.	17,618	35,663
Accounts payable	1,358	2,146
Accrued expenses and other current liabilities	2,116	6,715
Deferred revenue	1,453	5,061
Other liabilities	678	884
Liabilities of discontinued operations.	$ 5,605	$ 14,806