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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes and equity in earnings $ 23,237 $ 20,074 $ 16,826
Domestic
     
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes and equity in earnings 26,470 20,609 16,178
Foreign
     
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes and equity in earnings $ (3,233) $ (535) $ 648