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Income Taxes - Schedule of Reconciliation of U.S. Federal Statutory Income Tax Rate to Effective Tax Rates (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax rate 21.00% 35.00% 35.00%
U.S. tax reform 1.00% 43.40%  
Foreign source income not subject to U.S. income tax (2.20%) (4.20%) (9.30%)
Change in U.S. federal valuation allowance 2.10% (3.40%) (3.60%)
Share-based incentive compensation (5.00%) (4.00%)  
Foreign taxes 5.70% 1.80% 0.50%
Foreign tax credits (4.30%) (2.00%) (0.60%)
State and local taxes 2.00% 2.40% 3.00%
Income of non-controlling interests (0.10%) (0.30%) (0.30%)
Other 1.60% (0.20%) (0.80%)
Effective income tax rate 21.80% 68.50% 23.90%