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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]          
Corporate income tax rate     35.00% 35.00% 35.00%
Provisional Income tax expense $ 81,800,000   $ 81,800,000    
Income tax expense related to one time mandatory tax 83,500,000        
Income tax expense due to tax rate reform 1,700,000        
Total taxes paid     131,100,000 $ 117,400,000 $ 97,500,000
Cash and cash equivalents and marketable securities were held by foreign subsidiaries     815,200,000    
Unrecognized tax benefits that would affect the effective tax rate, if recognized 600,000   600,000    
Anticipated decrease in unrecognized tax benefits 0   $ 0    
State and local | Earliest Tax Year          
Income Tax Contingency [Line Items]          
Income tax examinations, years under examination     2001    
State and local | Latest Tax Year          
Income Tax Contingency [Line Items]          
Income tax examinations, years under examination     2017    
Non-U.S. | Earliest Tax Year          
Income Tax Contingency [Line Items]          
Income tax examinations, years under examination     2009    
Non-U.S. | Latest Tax Year          
Income Tax Contingency [Line Items]          
Income tax examinations, years under examination     2017    
U.S. federal | Earliest Tax Year          
Income Tax Contingency [Line Items]          
Income tax examinations, years under examination     2015    
U.S. federal | Latest Tax Year          
Income Tax Contingency [Line Items]          
Income tax examinations, years under examination     2017    
Scenario, Forecast          
Income Tax Contingency [Line Items]          
Corporate income tax rate   21.00%      
Discontinued Operations          
Income Tax Contingency [Line Items]          
Additional income tax accrual $ 38,600,000   $ 38,600,000