Stockholders' Equity (Detail) $ / shares in Units, $ in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2022 USD ($) item shares	Dec. 31, 2021 shares	Mar. 31, 2021 shares	Dec. 31, 2023 shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common shares					78,900	75,000
Shares available for purchase				523,647
Common Stock Dividend declared by directors | $ / shares					$ 0.25	$ 0.20
Special cash dividends per share | $ / shares					$ 1.75
Shares Repurchased in Market Transaction
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common shares	70,000
Shares Repurchased from Affiliates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common shares	8,900
Number of affiliates | item	2
Number of private transactions | item	2
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common shares	78,900	25,000	50,000			75,000
Purchase of common shares value | $	$ 1.7					$ 1.3
Class A Common Stock | Non-Employee | 2013 Director Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized to be issued under the plan				200,000
Shares available for award				124,450