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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Components Of Earnings Loss Before Income Taxes [Line Items]      
Domestic $ 17,728 $ 22,114 $ 22,096
Foreign (6,949) (112) (3,765)
Total income before income taxes and equity in earnings $ 10,779 $ 22,002 $ 18,331