2. Business acquisitions (Detail) - Pro-Forma Consolidated Results of Operations for Nine Months ended September 30, 2011 (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2011
Sales	$ 56,049
Net income	$ 4,378

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration