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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Computed tax expense at statutory federal rates | $ 3,874 | $ 3,993 | $ 7,054
Increase (decrease) in taxes resulting from: |  |  |
State taxes, net of federal income tax benefit | 559 | 1,131 | 1,627
Unrecognized tax benefits | (2,092) | 263 | 171
Bargain purchase gain on business acquisition | (978) |  |
Impact of the enactment of the Tax Cuts and Jobs Act (net) |  |  | 1,089
Income tax credits | (812) | (819) | (689)
Foreign tax rate differential | 2,145 | 341 | (37)
Subpart F income |  |  | 14
(Gain) on equity investments |  |  | (61)
Stock based compensation | 377 | 366 | 277
Global intangible low-taxed income |  | 249 |
Other | 7 | (322) | (300)
Total income tax expense (benefit) | $ 3,080 | $ 5,202 | $ 9,145

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