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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 | $ 2,124 | $ 5,136 | $ 573
State | 1,347 | (122) | 417
Foreign | 570 | 655 | 991
Deferred: |  |  |
Federal | 160 | (1,345) | (319)
State | 242 | 1,216 | 347
Total income tax expense (benefit) | $ 4,443 | $ 5,540 | $ 2,009

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