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v3.20.4

Schedule of Effective Income Tax Rate Reconciliation (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense at federal statutory rate | 21.00% | 21.00% | 21.00% | 35.00%
State taxes, net of federal tax effect | 18.00% | (1.70%) | (1.30%) |
Foreign earnings taxed at different rates | 21.70% | (6.10%) | (20.50%) |
Book tax difference in amortization of intangible property | (0.00%) | (4.60%) | (0.00%) |
Withholding tax | (12.50%) | 3.10% | 5.50% |
Foreign tax credit | 3.80% | (3.00%) | (5.20%) |
Other international components | (3.50%) | 0.20% | 0.30% |
Change in valuation allowance | 2.70% | 1.60% | 2.50% |
Deferred tax adjustments and rate changes | (3.40%) | 1.00% | (1.70%) |
Meals and entertainment | (1.30%) | 1.30% | 2.60% |
Non-deductible officers compensation | (12.50%) | 1.40% | 2.10% |
Subpart F income | (2.00%) | 3.20% | 7.00% |
Research and development tax credit | 19.90% | (9.30%) | (11.80%) |
Stock compensation | 11.80% | 1.80% | 5.80% |
GILTI, net of foreign tax credit | (1.10%) | 0.90% | 0.50% |
FDII | 3.10% | (1.90%) | (4.50%) |
Transition Tax | 0.00% | 0.00% | (15.20%) |
Other permanent differences | (3.40%) | 1.30% | 3.00% |
Total | 62.30% | 10.20% | (9.90%) |

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