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Income taxes - reconciliations between statutory federal income tax rate and effective income tax rate (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 35.00% | 35.00%
Tax effect of international items | (3.30%) | (25.70%) | (27.50%)
Impacts of the TCJA | (1.00%) | 37.90% | 0.00%
Excess tax benefits related to share-based compensation | (7.20%) | (2.30%) | 0.00%
State taxes, net of federal benefit | (0.10%) | 0.10% | 0.90%
Uncertain tax contingencies | (0.40%) | (1.80%) | (3.60%)
Contingent consideration | 5.30% | 0.40% | (1.20%)
Intellectual property impairment charge | (2.00%) | 0.00% | 0.00%
Research and development tax credit | (1.60%) | (0.80%) | (0.60%)
Other, net | (0.10%) | 2.70% | 0.30%
Effective income tax rate, total | 10.60% | 45.50% | 3.30%

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