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Income Taxes - Schedule of Income Tax Provision (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 6,234 | $ 4,957 | $ 3,429
State | 388 | 892 | 753
Foreign | 939 | 3,191 | 1,944
Current Income Tax Expense (Benefit), Total | 7,561 | 9,040 | 6,126
Deferred: |  |  |
Federal | (2,479) | (2,794) | (3,012)
State | 114 | (409) | (563)
Foreign | (758) | (547) | 87
Deferred income tax expense (benefit) | (3,123) | (3,750) | (3,488)
Income tax provision from continuing operations | $ 4,438 | $ 5,290 | $ 2,638

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