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Income Taxes - Reconciliation of the Federal Statutory Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income tax provision at federal statutory rate | 21.00% | 21.00% | 21.00%
Increase (decrease) in tax resulting from: |  |  |
State tax provision, net of federal benefit | 2.60% | 8.30% | 6.20%
Foreign tax rate differential | (0.20%) | 0.40% | (0.20%)
Stock option compensation | 5.70% | (1.20%) | (1.10%)
Withholding taxes | 3.30% | (3.50%) | 2.10%
Non-deductible expenses | 2.20% | (9.80%) | 5.30%
Change in valuation allowance | (5.80%) | 2.30% |
Foreign subsidiary income subject to U.S. tax | (4.30%) | (7.40%) |
Change in tax legislation | (0.019) | (0.012) | 0.019
Audit settlements |  | (8.30%) |
Other, net | 0.20% | (0.30%) | (0.60%)
Effective tax rate | 22.80% | 0.30% | 34.60%

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