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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Computed tax expense at statutory federal rates | $ 7,054 | $ 8,651 | $ 6,415
Increase (decrease) in taxes resulting from: |  |  |
State taxes, net of federal income tax benefit | 1,627 | 988 | 820
Domestic production deduction |  | (150) | (1,272)
Impact of the enactment of the Tax Cuts and Jobs Act (net) | 1,089 | (3,433) |
Income tax credits | (689) | (431) | (335)
Foreign tax rate differential | (37) | (1,503) | (1,587)
Subpart F income | 14 | 3 | 14
(Gain) loss on equity investments | (61) | 62 | 123
Stock based compensation | 277 | 262 | 208
Tax interest |  | (22) | 920
Other | (129) | 16 | 234
Total income tax expense (benefit) | $ 9,145 | $ 4,443 | $ 5,540

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