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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at the U.S. federal tax rate | 21.00% | 35.00% | 35.00%
Foreign income tax differential | 2.10% | (22.60%) | (14.00%)
U.S. tax on foreign earnings | 2.00% | 4.30% | 0.90%
State and local income taxes | (25.00%) | (11.00%) | 0.20%
U.S. permanent book/tax differences | (2.70%) | (1.50%) | 1.30%
U.S. research and development tax credits | (29.50%) | (11.20%) | (1.60%)
Change in valuation allowance | 27.70% | 10.00% | 0.80%
U.S. manufacturing deduction permanent difference | 0.00% | (8.00%) | (3.50%)
Goodwill impairment | 0.00% | 0.00% | 8.90%
Tax impact of sale of marketing applications business | 0.00% | 0.00% | 9.90%
Tax impact of equity compensation | (1.40%) | 0.70% | 2.40%
Tax impact of U.S. tax law change - IRC Section 987 | 0.00% | 0.00% | 3.50%
Deferred tax impact from U.S. rate change from Tax Reform | 0.00% | (27.00%) | 0.00%
Tax impact of U.S. Tax Reform/ Transition Tax | (23.90%) | 250.00% | 0.00%
Tax Impact of uncertain tax positions | 20.20% | (3.60%) | (0.60%)
Other, net | (1.60%) | 0.40% | 0.20%
Effective income tax rate | (11.10%) | 215.50% | 43.40%

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