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Income Taxes (Statutory Tax Rate and Effective Tax Rate) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |
Statutory federal tax | $ 28,196 | $ 19,396 | $ 14,815
State income taxes, net of federal benefit | 1,470 | 864 | 769
Share-based compensation | (415) | (6,424) | (1,852)
Other permanent differences | 1,218 | 1,004 | 615
Research and development and jobs credits | (370) | (579) | (85)
Valuation allowance | 1,342 |  |
Other | (236) | 182 | 323
Provision for income taxes | $ 31,406 | $ 14,447 | $ 14,759
Effective tax rate, Statutory federal tax | 21.00% | 21.00% | 21.00%
Effective tax rate, State income taxes, net of federal benefit | 1.10% | 0.90% | 1.10%
Effective tax rate, Share-based compensation | (0.30%) | (7.00%) | (2.60%)
Effective tax rate, Other permanent differences | 0.90% | 1.10% | 0.80%
Effective tax rate, Research and development and jobs credits | (0.30%) | (0.60%) | (0.10%)
Effective tax rate, Valuation allowance | 1.00% | 0.00% | 0.00%
Effective tax rate, Other | (0.20%) | 0.20% | 0.40%
Effective tax rate, Total | 23.40% | 15.60% | 20.90%
Inland Revenue, Hong Kong [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign taxes | $ 94 | $ 1 | $ 81
Effective tax rate, Foreign taxes | 0.10% | 0.00% | 0.10%
Inland Revenue, Singapore (IRAS) [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign taxes | $ 107 | $ 3 | $ 93
Effective tax rate, Foreign taxes | 0.10% | 0.00% | 0.20%

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