Goodwill and Other Intangible Assets Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 389,500		$ 389,500		$ 659,900
Total other intangible assets, net	702,500		702,500		$ 830,300
Amortization expense of intangible assets	(8,800)	$ (10,300)	18,800	$ 20,500
Estimated Future Amortization Expense by Fiscal Year [Abstract]
Remainder of 2016	17,300		17,300
2017	33,200		33,200
2018	28,300		28,300
2019	25,700		25,700
2020	25,000		25,000
2021	25,000		25,000
After 2021	214,800		$ 214,800
Deferred Income Taxes and Tax Credits	90,300
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 108,900