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Income Taxes (Statutory Tax Rate and Effective Tax Rate) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Examination [Line Items] |  |  |
Statutory federal tax | $ 45,405 | $ 28,196 | $ 19,396
Statutory federal tax, effective tax rate, percent | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit | $ 4,980 | $ 1,470 | $ 864
State income taxes, net of federal benefit, effective tax rate, percent | 2.30% | 1.10% | 0.90%
Share-based compensation - windfall | $ (1,835) | $ (415) | $ (6,424)
Share-based compensation - windfall, effective tax rate, percent | (0.80%) | (0.30%) | (7.00%)
Research and development and jobs credits | $ (503) | $ (370) | $ (579)
Research and development and jobs credits, effective tax rate, percent | (0.20%) | (0.30%) | (0.60%)
Executive compensation | $ 2,652 | $ 966 | $ 442
Executive compensation, effective tax rate, percent | 1.20% | 0.70% | 0.40%
Valuation allowance | $ 468 | $ 1,342 | $ 0
Valuation allowance, effective tax rate, percent | 0.20% | 1.00% | 0.00%
Other permanent differences | $ 808 | $ 16 | $ 744
Other permanent differences, effective tax rate, percent | 0.40% | 0.00% | 0.90%
Provision for income taxes | $ 52,098 | $ 31,406 | $ 14,447
Provision for income taxes, effective tax rate, percent | 24.10% | 23.40% | 15.60%
Inland Revenue, Hong Kong |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign taxes | $ 91 | $ 94 | $ 1
Foreign taxes, effective tax rate, percent | 0.00% | 0.10% | 0.00%
Inland Revenue, Singapore (IRAS) |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign taxes | $ 32 | $ 107 | $ 3
Foreign taxes, effective tax rate, percent | 0.00% | 0.10% | 0.00%

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