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Business segment information - Analysis of Property, Plant and Equipment of Reporting Segments by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Geographic Information [Line Items]
Property, plant and equipment, net	$ 51,362	$ 43,368
U.S. [Member]
Geographic Information [Line Items]
Property, plant and equipment, net	37,081	30,806
Italy [Member]
Geographic Information [Line Items]
Property, plant and equipment, net	7,617	7,663
U.K. [Member]
Geographic Information [Line Items]
Property, plant and equipment, net	1,402	1,449
Brazil [Member]
Geographic Information [Line Items]
Property, plant and equipment, net	3,421	2,532
Others [Member]
Geographic Information [Line Items]
Property, plant and equipment, net	$ 1,841	$ 918

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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