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Components of Income Before Income Taxes. Equity in Earnings and Extra Ordinary Items (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes and equity in earnings $ 18,331 $ 13,862 $ 23,237
Domestic      
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes and equity in earnings 22,096 10,251 26,470
Foreign      
Components Of Earnings Loss Before Income Taxes [Line Items]      
Income before income taxes and equity in earnings $ (3,765) $ 3,611 $ (3,233)