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
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Carrying value $ 151,561 $ 147,312
Fair value 137,285 132,912
June Unsecured Debentures    
Debt Instrument [Line Items]    
Carrying value 16,818 16,175
Fair value 15,371 14,787
June Secured Debentures    
Debt Instrument [Line Items]    
Carrying value 119,645 116,340
Fair value 107,014 103,612
Secured Notes    
Debt Instrument [Line Items]    
Carrying value 14,166 13,852
Fair value 13,965 13,694
Other    
Debt Instrument [Line Items]    
Carrying value 932 945
Fair value $ 935 $ 819