Goodwill and other intangible assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 149,486	$ 98,766	$ 63,491
Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite lived intangible assets	233,500
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	16,900
Finite-lived intangible assets, net of tax	$ 8,600