Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Effective income tax rate		10.00%	9.00%	19.70%
Operating loss carryforwards		$ 406,000,000
Tax credits		36,000,000
GILTI, provisional income tax expense		8,000,000	$ 12,000,000	$ 10,000,000
Unrecognized tax benefits that would affect annual effective tax rate	$ 9,000,000	8,000,000	9,000,000
Tax dispute	19,000,000
Lapse of statute of limitations		1,000,000	20,000,000
Unrecognized tax benefits that may reverse		0
Interest and or penalties related to Income tax matters		(2,000,000)	6,000,000	$ 8,000,000
Penalties and interest accrued	$ 8,000,000	6,000,000	$ 8,000,000
Expire Year 2021 thru 2040
Income Tax Contingency [Line Items]
Net operating loss carryforwards		72,000,000
Expire Year 2021 thru 2037
Income Tax Contingency [Line Items]
Tax credits		$ 29,000,000