Income Taxes - Reconciliation of Tax Provision for Continuing Operations (Detail)	12 Months Ended
	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%