Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Federal Taxes on Mandatory Deemed Repatriation		$ (16,800,000)
Provision for income taxes	$ 451,900,000	$ 401,400,000	$ 434,900,000
Effective income tax rate reconciliation, percent	23.20%	20.50%
Impact of Tax Cuts and Jobs Act	$ 0	$ (4,800,000)	(53,100,000)
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Liability, Income Tax Benefit		(12,700,000)
Unrecognized tax benefit	25,300,000	21,900,000	27,700,000	$ 17,200,000
Increase in net income from recognition of unrecognized tax benefits	22,700,000	19,800,000
Increase (decrease) in unrecognized tax benefits	(3,400,000)	5,800,000
Interest and penalties, net of tax, included in the provision (benefit) for income taxes	1,300,000	300,000	100,000
Income tax examination, penalties and interest accrued	8,400,000	9,200,000
Valuation allowance	29,800,000	300,000
Tax Year 2013 through 2016
Tax Credit Carryforward [Line Items]
Provision for income taxes			$ 17,600,000
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	1,000,000.0	300,000
Valuation allowance	300,000	$ 300,000.0
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 29,500,000