Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Apr. 01, 2017	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Impairment of goodwill		$ 0
Intangible asset amortization expense	$ 22,500,000		$ 22,400,000
Future amortization expense, in 2018	88,600,000
Future amortization expense, in 2019	86,700,000
Future amortization expense, in 2020	84,400,000
Future amortization expense, in 2021	83,100,000
Future amortization expense, in 2022	$ 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