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Income Taxes - Income Tax Benefits in Shareholders' Equity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, Tax Benefit from Stock Compensation | $ (92,234) | $ (101,466) | $ (77,478)

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