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Income Taxes - Reconciliation of Provision to U.S. Federal Statutory Income Tax Rate for Income from Continuing Operations (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax rate 35.00% 35.00% 35.00%
U.S. state and local income taxes, net of U.S. federal income tax benefits 1.84% 2.38% 4.44%
Change in tax rates applicable to non-U.S. earnings (7.60%) (3.73%) (2.73%)
Domestic tax credits and incentives (0.24%) (0.26%) (2.62%)
Net tax charge related to Tax Reform 7.40%    
Excess Stock Based Compensation (1.25%)    
Other (0.25%) (0.98%) 0.10%
Effective income tax rate 34.90% 32.41% 34.19%