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Income Taxes - Reconciliation of Tax Provision for Continuing Operations (Detail) | 12 Months Ended
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Dec. 31, 2020 Rate | Dec. 31, 2019 Rate | Dec. 31, 2018 Rate
Income Tax Disclosure [Abstract] |  |  |
Tax provision at U.S. statutory rate | 21.00% | 21.00% | 21.00%
Foreign tax rate differential | 1.60% | 2.80% | 3.70%
Tax on undistributed foreign earnings | 7.40% | 1.80% | (1.20%)
Audit settlements and unrecognized tax benefits | (5.40%) | 0.10% | (0.30%)
Effective Income Tax Reconciliation, Pension settlement AOCI expense | 5.90% | 0.00% | 0.00%
Italy patent box | (5.60%) | (1.20%) | (1.00%)
Excess tax benefits on stock-based compensation | (3.60%) | (1.10%) | (0.60%)
State and local income tax | (2.40%) | 0.70% | 1.50%
Valuation allowance on deferred tax assets | 1.50% | (0.50%) | (2.40%)
U.S. tax on foreign earnings | (0.20%) | 0.00% | 0.50%
U.S. permanent items | (0.10%) | (1.00%) | 0.40%
Tax exempt interest | 0.00% | 0.00% | (5.80%)
One-time tax on foreign earnings - Tax Act | 0.00% | 0.00% | (1.00%)
Federal deferred taxes remeasurement - Tax Act | 0.00% | 0.00% | 0.40%
Other adjustments | (2.10%) | (0.90%) | (0.40%)
Effective income tax rate | 18.00% | 21.70% | 14.80%

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