Income Taxes - Reconciliation of Statutory Income Tax Rate to Our Effective Tax Rate for Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
At U.S. statutory tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	5.20%	4.40%	6.10%
Effective Income Tax Rate Reconciliation, Disallowed Executive Compensation, Percent	1.20%	(2.80%)	2.00%
Meals and entertainment	0.10%	(0.60%)	1.60%
Tax credits / Section 199 Deduction	(1.30%)	3.00%	(3.10%)
Effective Income Tax Rate Reconciliation, CARES Act	(0.038)	0.044	0
Valuation allowance	1.10%	(3.10%)	(2.90%)
Effective Income Tax Rate Reconciliation, Realized Investment (Gains) Losses, Percent	(1.10%)	2.60%	(1.80%)
Effective Tax Rate Reconciling Item, Deferred Tax Adjustments	(0.20%)	1.70%	0.60%
Net tax (benefit) expense related to “check-the-box” election (1)	0.00%	0.00%	(1.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent	0.70%	(4.30%)	1.10%
Foreign source income	(0.20%)	0.50%	(0.50%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.00%	(0.80%)	(0.10%)
Effective Tax Rate Reconciling Item, Unrecognized Tax Benefits	0	(0.020)	(0.004)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent	0.00%	(2.60%)	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	1.30%	(3.00%)	3.10%
Effective income tax expense rate for continuing operations	21.30%	30.00%	20.00%