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Schedule of Effective Income Tax Rate Reconciliation (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at federal statutory rate | 21.00% | 35.00% | 35.00%
State taxes, net of federal tax effect | (1.30%) | 2.50% | 1.60%
Foreign earnings taxed at different rates | (20.50%) | (24.20%) | (15.40%)
Withholding tax | 5.50% | 1.90% | 1.30%
Foreign tax credit | (5.20%) | (1.10%) | (0.90%)
Other international components | 0.30% | 0.00% | (0.10%)
Change in valuation allowance | 2.50% | 0.20% | (0.80%)
Deferred tax adjustments and rate changes | (1.70%) | 4.00% | 0.00%
Section 199 Deduction | (0.00%) | (1.40%) | (1.80%)
Subpart F income | 7.00% | 1.50% | 0.60%
Research and development tax credit | (11.80%) | (1.10%) | (0.80%)
GILTI, net of foreign tax credit | 0.50% | 0.00% | 0.00%
FDII | (4.50%) | (0.00%) | (0.00%)
Transition Tax | (15.20%) | 55.40% | 0.00%
Other permanent differences | 13.50% | 1.80% | 1.00%
Total | (9.90%) | 74.50% | 19.70%

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