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Components of Income Before Income Taxes, Equity in Earnings and Extra Ordinary Items (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes, equity in earnings and extraordinary income $ 20,074 $ 16,826 $ 19,668
Domestic
     
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes, equity in earnings and extraordinary income 20,609 16,178 20,867
Foreign
     
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes, equity in earnings and extraordinary income $ (535) $ 648 $ (1,199)