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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Statutory rate | 21.00% | 21.00% | 35.00%
Foreign income inclusions | 0.30% | 0.70% | 2.10%
Foreign tax rate differential | (0.20%) | (0.50%) | (13.70%)
Tax charge/(credit) from previous years | 1.80% | 0.70% | 1.10%
Net charge/(credit) from unrecognized tax benefits | 1.10% | 0.30% | (0.40%)
Foreign currency transactions | (0.30%) | 1.40% | (0.90%)
Effect of U.S. tax law change | 0.60% | 9.30% | 31.70%
Tax on unremitted earnings | (0.10%) | 0.90% | 0.00%
Non-deductible foreign interest | 0.80% | 1.30% | 1.10%
Other items and adjustments, net | 0.40% | 0.30% | (4.20%)
Effective Income Tax Rate | 25.40% | 35.40% | 51.80%

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