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Provision for Income Taxes (Before Equity in Earnings) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 7,041 $ 8,000 $ 5,584
State and local 957 498 1,879
Foreign 4 483 604
Deferred 1,030 (1,951) (1,440)
Income tax provision $ 9,032 $ 7,030 $ 6,627