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Income Taxes - Reconciliation of Tax Provision for Continuing Operations (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017 Rate | Dec. 31, 2016 | Dec. 31, 2016 Rate | Dec. 31, 2015 | Dec. 31, 2015 Rate
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Tax provision at U.S. statutory rate |  | 35.00% |  | 35.00% |  | 35.00%
Federal deferred taxes remeasurement - Tax Act |  | 27.80% |  | 0.00% |  | 0.00%
One-time tax on foreign earnings - Tax Act |  | 18.80% |  | 0.00% |  | 0.00%
Foreign tax rate differential |  | (8.60%) |  | (3.50%) |  | (4.70%)
Tax exempt interest |  | (7.80%) |  | (5.20%) |  | (6.70%)
Valuation allowance on deferred tax assets |  | 7.20% |  | 1.40% |  | 3.30%
Tax on undistributed foreign earnings |  | (4.80%) |  | 4.90% |  | (5.60%)
U.S. permanent items |  | (2.20%) |  | (1.90%) |  | (1.00%)
Italy patent box prior year benefit |  | (1.10%) |  | 0.00% |  | 0.00%
Audit settlements and unrecognized tax benefits |  | (0.80%) |  | (5.20%) |  | (5.00%)
U.S. tax on foreign earnings |  | 0.30% |  | 4.70% |  | 3.80%
State and local income tax |  | 0.30% |  | (0.10%) |  | 1.00%
Foreign tax holiday |  | 0.00% |  | 0.00% |  | (1.10%)
Other adjustments |  | (1.20%) |  | (0.70%) |  | (0.70%)
Effective income tax rate | 62.90% | 62.90% | 29.40% | 29.40% | 18.30% | 18.30%

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