Quarterly report pursuant to Section 13 or 15(d)

Selected Balance Sheet Data - Narrative (Detail)

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Selected Balance Sheet Data - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 01, 2022
Jan. 01, 2021
Jan. 01, 2014
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Mar. 31, 2013
Schedule Of Accrued Expenses [Line Items]              
Advances and loans and commissions receivable allowance for credit loss       $ 797   $ 680  
SARs frozen liability amount       $ 9,007   $ 11,418  
Treasury note term       1 year      
Interest expense       $ 199 $ 215    
Commissions Payable              
Schedule Of Accrued Expenses [Line Items]              
Maximum payment deferral period for certain commissions payable       3 years      
SARs              
Schedule Of Accrued Expenses [Line Items]              
SARs frozen liability amount             $ 20,000
Treasury note term     10 years        
Base spread on SARs liability variable rate     2.00%        
SARs liability interest accrual rates 5.79% 5.95%          
Interest expense       $ 170 190    
Payments for SARs Liability       $ 2,300 2,500    
Deferred Compensation Liability              
Schedule Of Accrued Expenses [Line Items]              
Fair value of deferred compensation plan assets       110.00%      
Payments made during the period       $ 71 $ 48    
Deferred Compensation Liability | Minimum              
Schedule Of Accrued Expenses [Line Items]              
Payout period       2 years      
Deferred Compensation Liability | Maximum              
Schedule Of Accrued Expenses [Line Items]              
Payout period       15 years