Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities and Debt - Additional Information (Details)

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Credit Facilities and Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
May 03, 2024
Nov. 06, 2023
Mar. 31, 2023
Sep. 30, 2024
Line Of Credit Facility [Line Items]        
Maturity date Jun. 30, 2026      
Surety bonds       $ 17,500,000
Debt instrument, interest rate terms   principal and interest payable in 15 equal annual installments    
Percentage of provision required from proceeds received in excess of sale of real estate       50.00%
Proceeds from sale of real estate required to make provision       $ 8,000,000
Short-term Premium Finance Arrangement        
Line Of Credit Facility [Line Items]        
Stated interest rate (percentage)     4.30%  
Short-term premium finance     $ 2,400,000  
Short-term premium finance, Number of installment     payable in ten equal monthly installments through March 2023  
Note Agreement        
Line Of Credit Facility [Line Items]        
Stated interest rate (percentage)       2.90%
Short-term premium finance       $ 13,700,000
General Liability Arrangement        
Line Of Credit Facility [Line Items]        
Stated interest rate (percentage)       6.60%
Short-term premium finance       $ 500,000
Short-term premium finance, Number of installment       payable in eight equal monthly installments through August 2023
Insurance Finance and General Liability Arrangements        
Line Of Credit Facility [Line Items]        
Principal payments       $ 1,300,000
Promissory Note | Note Agreement        
Line Of Credit Facility [Line Items]        
Stated interest rate (percentage)   3.00%    
Debt instrument, issued, principal   $ 20,000,000    
Debt instrument, frequency of periodic payment   15    
Debt instrument, periodic payment   $ 1,700,000    
Debt instrument, maturity date, start   Dec. 31, 2024    
Debt instrument, maturity date, end   Dec. 31, 2038    
Forty Vehicle Ferry Projects        
Line Of Credit Facility [Line Items]        
Surety bonds subject to dispute       12,600,000
Fabrication        
Line Of Credit Facility [Line Items]        
Surety bonds subject to dispute       4,900,000
Maximum        
Line Of Credit Facility [Line Items]        
Letter of credit facility       $ 10,000,000
LC Facility        
Line Of Credit Facility [Line Items]        
Fees on undrawn borrowings (percentage)       0.40%
Total outstanding letters of credit       $ 1,500,000
Letter of Credit        
Line Of Credit Facility [Line Items]        
Stated interest rate (percentage)       1.50%