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Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ (965) $ 8,337 $ 245
State and local (39) 518 184
Total current (benefit) expense (1,004) 8,855 429
Deferred      
Federal (2,221) 537 3,610
State and local 416 2 90
Total deferred income tax (benefit) expense (1,805) 539 3,700
Total income tax (benefit) expense $ (2,809) $ 9,394 $ 4,129