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Goodwill and Other Intangible Assets Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]            
Goodwill $ 392,900     $ 392,900   $ 659,900
Total other intangible assets, net 694,400     694,400   $ 830,300
Amortization of intangible assets 8,700   $ 10,400 27,500 $ 30,900  
Estimated Future Amortization Expense by Fiscal Year [Abstract]            
Remainder of 2016 8,700     8,700    
2017 33,300     33,300    
2018 28,300     28,300    
2019 25,700     25,700    
2020 25,000     25,000    
2021 25,000     25,000    
After 2021 $ 214,700     $ 214,700    
Deferred Income Taxes and Tax Credits   $ 90,300        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 108,900