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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory rate | 21.00% | 21.00% | 21.00%
Foreign income inclusions | 7.10% | 0.30% | 0.70%
Foreign tax rate differential | 4.20% | (0.30%) | (0.80%)
Tax charge/(credit) from previous years | 3.70% | 1.80% | 0.70%
Net charge/(credit) from unrecognized tax benefits | (1.70%) | 1.10% | 0.30%
Foreign currency transactions | (4.50%) | (1.00%) | 1.20%
Effect of U.S. tax law change | 0.00% | 0.60% | 9.30%
Tax on unremitted earnings | 0.30% | (0.10%) | 0.90%
Non-deductible foreign interest | 0.70% | 0.80% | 1.30%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 6.90% | 0.00% | 0.00%
State and local taxes | 1.50% | 1.40% | 1.20%
US incentive for foreign derived intangible income | (1.50%) | (0.50%) | (1.00%)
Innovation incentives – current year | (4.90%) | (0.60%) | (0.60%)
Innovation incentives – prior years | (5.30%) | 0.00% | 0.00%
Non-deductible officer compensation | 1.80% | 0.20% | 0.40%
Other items and adjustments, net | (1.60%) | 0.70% | 0.80%
Effective Income Tax Rate | 27.70% | 25.40% | 35.40%

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