Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 12.8	$ 10.3
Accrued interest related to uncertain tax positions	$ 4.0	$ 3.3
U.S. Federal [Member]
Income Tax Examination [Line Items]
Open tax year	2008
U.S. State and Local [Member]
Income Tax Examination [Line Items]
Open tax year	2009
Non-U.S [Member]
Income Tax Examination [Line Items]
Open tax year	2012