Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Summary of Companys Long Term Debt Instruments at their Carrying Value and Fair Value (Detail)

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Financial Instruments - Summary of Companys Long Term Debt Instruments at their Carrying Value and Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Carrying value $ 160,552 $ 147,312
Fair value 148,969 132,912
June Unsecured Debentures    
Debt Instrument [Line Items]    
Carrying value 18,162 16,175
Fair value 16,876 14,787
June Secured Debentures    
Debt Instrument [Line Items]    
Carrying value 126,542 116,340
Fair value 115,977 103,612
Secured Notes    
Debt Instrument [Line Items]    
Carrying value 15,084 13,852
Fair value 15,330 13,694
Other    
Debt Instrument [Line Items]    
Carrying value 764 945
Fair value $ 786 $ 819