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Income Taxes - Difference Between the Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at the U.S. federal tax rate | 21.00% | 21.00% | 35.00%
Foreign income tax differential | (49.20%) | 2.10% | (22.60%)
U.S. tax on foreign earnings | (8.40%) | 2.00% | 4.30%
State and local income taxes | 58.20% | (25.00%) | (11.00%)
U.S. permanent book/tax differences | (17.00%) | (2.70%) | (1.50%)
U.S. research and development tax credits | 68.50% | (29.50%) | (11.20%)
Change in valuation allowance | (49.10%) | 27.70% | 10.00%
U.S. manufacturing deduction permanent difference | 0.00% | 0.00% | (8.00%)
Tax impact of equity compensation | (49.30%) | (1.40%) | 0.70%
Deferred tax impact from U.S. rate change from Tax Reform | 0.00% | 0.00% | (27.00%)
Tax impact of U.S. Tax Reform/Transition Tax | 0 | (0.239) | 2.500
Tax Impact of uncertain tax positions | (24.60%) | 20.20% | (3.60%)
Other, net | (3.90%) | (1.60%) | 0.40%
Effective income tax rate | (53.80%) | (11.10%) | 215.50%

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