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Income Taxes - Reconciliation of the Federal Statutory Rate (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax provision at federal statutory rate | 21.00% | 21.00% | 35.00%
Increase (decrease) in tax resulting from: |  |  |
State tax provision, net of federal benefit | 8.30% | 6.20% | 4.00%
Foreign tax rate differential | 0.40% | (0.20%) | (3.40%)
Stock option compensation deduction | (1.20%) | (1.10%) | 0.10%
Withholding taxes | (3.50%) | 2.10% | 1.70%
Non-deductible expenses | (9.80%) | 5.30% | 1.80%
Change in valuation allowance | 2.30% |  | 3.90%
Foreign subsidiary income subject to U.S. tax | (7.40%) |  |
Change in tax legislation | (0.012) | 0.019 | 0.058
Audit settlements | (8.30%) |  | (4.00%)
Other, net | (0.30%) | (0.60%) | (0.20%)
Effective tax rate | 0.30% | 34.60% | 44.70%

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