Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jul. 01, 2017	Jul. 01, 2018	Jun. 30, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Impairment of goodwill		$ 0
Intangible asset amortization expense	$ 22,100,000		$ 23,000,000	$ 45,400,000	$ 44,600,000
Future amortization expense, in 2018	88,600,000				88,600,000
Future amortization expense, in 2019	86,700,000				86,700,000
Future amortization expense, in 2020	84,400,000				84,400,000
Future amortization expense, in 2021	83,100,000				83,100,000
Future amortization expense, in 2022	$ 80,800,000				$ 80,800,000
Minimum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life					5 years	5 years
Maximum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life					22 years	22 years