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Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jul. 12, 2021
Related Party Transaction [Line Items]
Receivables from employees and executive officers	$ 1,066,000	$ 1,066,000
Vistar Media
Related Party Transaction [Line Items]
Equity method investment			$ 30,000,000
Minority interest, percentage			20.00%
Revenues	10,586
Advertising expense	$ 880
Sean E. Reilly and Kevin P. Reilly, Jr. \| RTC Holdings, LLC
Related Party Transaction [Line Items]
Ownership interest in limited liability company	100.00%
Chief Executive Officer, Chairman of Board of Directors, President and Families \| RTC Holdings, LLC
Related Party Transaction [Line Items]
Ownership interest in limited liability company	89.00%
Reilly Family, LLC \| RTC Holdings, LLC
Related Party Transaction [Line Items]
Ownership interest in limited liability company	11.00%
EATEL CORP, LLC \| RTC Holdings, LLC
Related Party Transaction [Line Items]
Aggregate amount paid on backup-recovery services	$ 315,000	311,000
Advertising services aggregate amount	$ 139,000	$ 134,000