Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Income Tax [Line Items]
Cumulative Loss Position Period	3 years
Uncertain tax positions	$ 0	$ 0	$ 0
Unrecognized tax benefits, income tax penalties and interest expense	0
Unrecognized tax benefits, income tax penalties and interest accrued	0
Valuation Allowance	199,000,000	138,000,000	129,000,000
Valuation allowance	7,000,000
Foreign tax credit carryforwards	7,000,000	$ 7,000,000	$ 8,000,000
Undistributed earnings	12,000,000
Additional income taxes provided for other foreign earnings or any additional outside basis differences inherent in foreign subsidiaries	$ 0
Minimum [Member]
Schedule Of Income Tax [Line Items]
Foreign tax credits expiration year	2024
Maximum [Member]
Schedule Of Income Tax [Line Items]
Foreign tax credits expiration year	2027
Federal [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards	$ 315,000,000
Operating Loss Carryforwards with expiration date	218,000,000
Operating Loss Carryforwards without expiration date	97,000,000
Deferred tax benefit	66,000,000
Valuation Allowance	$ 66,000,000
Federal [Member] | Minimum [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards expiration year	2036
Federal [Member] | Maximum [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards expiration year	2037
State [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards	$ 181,000,000
Deferred tax benefit	10,000,000
Valuation allowance	$ 10,000,000
State [Member] | Minimum [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards expiration year	2021
State [Member] | Maximum [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards expiration year	2040
Foreign Country [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards	$ 15,000,000
Operating Loss Carryforwards with expiration date	3,000,000
Operating Loss Carryforwards without expiration date	12,000,000
Valuation allowance	$ 3,000,000
Foreign Country [Member] | Minimum [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards expiration year	2021
Foreign Country [Member] | Maximum [Member]
Schedule Of Income Tax [Line Items]
Operating loss carryforwards expiration year	2040
U.S. [Member]
Schedule Of Income Tax [Line Items]
Change in valuation allowance	$ 58,000,000
Other Foreign Jurisdictions [Member]
Schedule Of Income Tax [Line Items]
Change in valuation allowance	$ 3,000,000