Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowance for net deferred tax assets	$ 18,100,000	$ 20,000,000.0
Deferred tax assets, valuation allowance result in income tax expense		12,700,000
Income tax expense (benefit)	100,000	11,100,000	$ (1,400,000)
Income (Loss) from continuing operations before taxes	800,000	10,200,000	7,400,000
Gross deferred tax assets	32,900,000	35,400,000
Deferred tax assets, net of valuation allowance	14,800,000	15,400,000
Deferred tax liabilities	14,800,000	15,400,000
Net deferred tax assets	0	0
Additional interest expense deduction	4,300,000
Uncertain tax positions	0	$ 0
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Federal tax loss carryforwards	$ 300,000		$ 41,400,000
Operating loss carryforwards expiration year			2030
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards expiration year	2040