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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Statutory rate | 21.00% | 35.00% | 35.00%
Foreign income inclusions | 0.70% | 2.10% | 1.00%
Foreign tax rate differential | (0.50%) | (13.70%) | (16.60%)
Tax charge/(credit) from previous years | 0.70% | 1.10% | (0.70%)
Net charge/(credit) from unrecognized tax benefits | 0.30% | (0.40%) | (1.60%)
Foreign currency transactions | 1.40% | (0.90%) | 2.40%
United Kingdom income tax rate reduction | (0.00%) | (0.00%) | (0.60%)
Effect of U.S. tax law change | 9.30% | 31.70% | 0.00%
Tax on unremitted earnings | 90.00% | 0.00% | 0.00%
Non-deductible foreign interest | 130.00% | 110.00% | 0.00%
Other items and adjustments, net | 0.30% | (4.20%) | 2.20%
Effective Income Tax Rate | 35.40% | 51.80% | 21.10%

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