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Unaudited Pro Forma Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Business Acquisition, Pro Forma Information [Line Items]    
Revenue $ 144,517 $ 101,891
Net income (loss) from continuing operations 1,626 (15,232)
Net income (loss) applicable to common stockholders $ 1,570 $ (14,959)