Basis of Presentation and Summary of Significant Accounting Policies - Property, Plant and Equipment by Geographic Location (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 283,200,000	$ 272,600,000
Impairment of Intangible Assets (Excluding Goodwill)	0	0	$ 8,800,000
Impairment of long-lived assets	0	0	$ 0
U.S.
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	172,300,000	156,900,000
Western Europe
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	69,700,000	76,600,000
Developing
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	31,100,000	28,800,000
Other Developed
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 10,100,000	$ 10,300,000