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Income Taxes - Reconciliation of U.S. Federal Statutory Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
U.S. statutory rate% | 21.00% | 21.00% | 21.00%
Change in valuation allowance | (0.30%) | (176.10%) | (10.80%)
State income taxes, net of federal benefit | 2.20% | 3.90% | 31.20%
Share-based compensation | 3.90% | (5.80%) | 10.00%
International tax rate differential | 8.90% | 3.80% | (13.40%)
Foreign dividend income |  |  | (20.10%)
Foreign capital gain income | (7.50%) | 3.20% | (7.10%)
Unremitted foreign earnings | 14.50% | (2.00%) | (4.10%)
Global intangible low-taxed income |  |  | (23.00%)
Base erosion tax | 33.90% | 19.90% | (14.10%)
Reserve for tax contingencies | 1.20% | (0.30%) | (0.40%)
Change in tax rate |  | (1.00%) | 5.90%
Other | 2.20% | 4.00% | (6.30%)
Income tax provision% | 80.00% | (129.40%) | (31.20%)

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