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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Statutory rate | 35.00% | 35.00% | 35.00%
Foreign income inclusions | 1.00% | 1.80% | 5.50%
Foreign tax rate differential | (16.60%) | (9.60%) | (14.60%)
Tax (credit)/charge from previous years | (0.70%) | (0.50%) | 4.70%
Net (credit) from unrecognized tax benefits | (1.60%) | (1.50%) | (6.20%)
Foreign currency transactions | 2.40% | (1.90%) | 1.00%
United Kingdom income tax rate reduction | (0.60%) | (0.70%) | (0.00%)
Other items and adjustments, net | 2.20% | (1.10%) | (1.20%)
Effective Income Tax Rate | 21.10% | 21.50% | 24.20%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax charges (credits) + References No definition available. + Details
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