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Income Taxes - Reconciliation of Tax Provision for Continuing Operations (Detail) | 12 Months Ended
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Dec. 31, 2019 Rate | Dec. 31, 2018 Rate | Dec. 31, 2017 Rate
Income Tax Disclosure [Abstract] |  |  |
Tax provision at U.S. statutory rate | 21.00% | 21.00% | 35.00%
Foreign tax rate differential | 2.80% | 3.70% | (7.80%)
U.S. permanent items | (2.10%) | (0.20%) | (2.20%)
Tax on undistributed foreign earnings | 1.80% | (1.20%) | (4.80%)
Italy patent box | (1.20%) | (1.00%) | (0.80%)
Italy patent box discrete benefit relating to prior years | 0.00% | 0.00% | (1.10%)
State and local income tax | 0.70% | 1.50% | 0.30%
Valuation allowance on deferred tax assets | (0.50%) | (2.40%) | 7.20%
Audit settlements and unrecognized tax benefits | 0.10% | (0.30%) | (0.80%)
Tax exempt interest | 0.00% | (5.80%) | (7.80%)
One-time tax on foreign earnings - Tax Act | 0.00% | (1.00%) | 18.80%
Federal deferred taxes remeasurement - Tax Act | 0.00% | 0.40% | 27.80%
U.S. tax on foreign earnings | 0.00% | 0.50% | 0.30%
Other adjustments | (0.90%) | (0.40%) | (1.20%)
Effective income tax rate | 21.70% | 14.80% | 62.90%

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