Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance for Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation allowance, Beginning balance	[1]	$ 44,999	$ 48,037	$ 50,519
Valuation allowance, Additions/Charges to Expense	[1]	68
Valuation allowance, Deductions/ Other	[1]	(16,040)	(3,038)	(2,482)
Valuation allowance, Ending balance	[1]	29,027	44,999	48,037
Valuation Allowance for Credit Losses [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation allowance, Beginning balance		31,964	24,836	22,534
Valuation allowance, Additions/Charges to Expense		47,561	43,470	32,042
Valuation allowance, Deductions/ Other		(37,378)	(36,342)	(29,740)
Valuation allowance, Ending balance		$ 42,147	$ 31,964	$ 24,836

[1] Amounts include both continuing and discontinued operations gross deferred tax balances.