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Income Taxes - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income taxes computed at the federal statutory rate, Value | $ 3,196 | $ 1,977 | $ 1,002
State income taxes, net of federal tax benefit, Value | 404 | 387 | 116
Excess tax benefits from stock options/restricted shares | (9) | (93) | (140)
Estimated charge for U.S. tax reform |  | 251 | 372
Charge for global intangible low-taxed income ("GILTI") | 69 |  |
Difference in tax rate on foreign earnings/other | 414 | 201 | (28)
Total provision for income taxes | $ 4,074 | $ 2,723 | $ 1,322
Income taxes computed at the federal statutory rate | 21.00% | 21.00% | 34.00%
State income taxes, net of federal tax benefit | 2.70% | 4.10% | 3.90%
Excess tax benefit from stock options/restricted shares | (0.10%) | (1.00%) | (4.70%)
Estimated charge for U.S. tax reform |  | 2.70% | 12.60%
Charge for global intangible low-taxed income ("GILTI") [Rate] | 0.50% |  |
Difference in income tax rate on foreign earnings/other | 2.70% | 2.10% | (1.00%)
Effective for income tax rate, Total | 26.80% | 28.90% | 44.80%

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