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Retirement Plans, Information About Plan Assets and Asset Allocation (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Information about Plan Assets [Abstract]      
Service period of participants not impacted by pension plan amendment 15 years    
Age of plan participants not impacted by pension plan amendment 50 years    
Service period of participants who are age fifty not impacted by pension plan amendment 10 years    
Real Estate Investment [Member] | Level 3 [Member]      
Information about Plan Assets [Abstract]      
Fair value of plan assets $ 0 $ 138,000,000  
Cash and Equity Securities [Member] | Level 1 [Member]      
Information about Plan Assets [Abstract]      
Fair value of plan assets 5,406,000 25,032,000  
Plan 2018 [Member] | Higman [Member]      
Information about Plan Assets [Abstract]      
Pension contributions     $ 1,615,000
Plan 2019 [Member] | Higman [Member]      
Information about Plan Assets [Abstract]      
Pension contributions 479,000 797,000 1,449,000
Plan 2020 [Member] | Higman [Member]      
Information about Plan Assets [Abstract]      
Pension contributions   1,438,000  
Pension Plan [Member]      
Information about Plan Assets [Abstract]      
Pension contributions 479,000 2,235,000  
Fair value of plan assets $ 430,821,000 $ 395,137,000 $ 358,197,000
Expected long-term rate of return on plan assets 6.75% 6.75% 7.00%
Contribution percentage to defined contribution plan 92.00%    
Discount rate 2.80% 3.50% 4.40% [1]
Asset Allocation Among Asset Categories [Abstract]      
Asset allocations 100.00% 100.00%  
Pension Plan [Member] | Minimum [Member]      
Information about Plan Assets [Abstract]      
Discount rate 2.80% 3.10%  
Pension Plan [Member] | Maximum [Member]      
Information about Plan Assets [Abstract]      
Discount rate 2.90% 3.50%  
Pension Plan [Member] | Higman [Member]      
Information about Plan Assets [Abstract]      
Discount rate 2.90% 3.10%  
Pension Plan [Member] | U.S. Equity Securities [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Asset allocations 51.00% 53.00%  
Target allocations 50.00%    
Pension Plan [Member] | U.S. Equity Securities [Member] | Minimum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 30.00%    
Pension Plan [Member] | U.S. Equity Securities [Member] | Maximum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 70.00%    
Pension Plan [Member] | International Equity Securities [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Asset allocations 20.00% 20.00%  
Target allocations 20.00%    
Pension Plan [Member] | International Equity Securities [Member] | Minimum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 0.00%    
Pension Plan [Member] | International Equity Securities [Member] | Maximum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 30.00%    
Pension Plan [Member] | Debt Securities [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Asset allocations 29.00% 25.00%  
Target allocations 30.00%    
Pension Plan [Member] | Debt Securities [Member] | Minimum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 15.00%    
Pension Plan [Member] | Debt Securities [Member] | Maximum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 55.00%    
Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Asset allocations 0.00% 2.00%  
Target allocations 0.00%    
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Minimum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 0.00%    
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Maximum [Member]      
Asset Allocation Among Asset Categories [Abstract]      
Target allocations 5.00%    
SERP [Member]      
Information about Plan Assets [Abstract]      
Pension contributions $ 160,000 $ 146,000  
Fair value of plan assets $ 0 $ 0 $ 0
Expected long-term rate of return on plan assets 0.00% 0.00% 0.00%
Discount rate [1] 2.80% 3.50% 4.40%
Other Postretirement Benefits [Member]      
Information about Plan Assets [Abstract]      
Pension contributions $ 168,000 $ 139,000  
Fair value of plan assets $ 0 $ 0 $ 0
Pension plan defined benefit plan cost increase limit percentage 4.00%    
Discount rate 2.80% 3.50% 4.40%
Seafarers Pension Trust [Member]      
Information about Plan Assets [Abstract]      
Pension contributions $ 541,000 $ 617,000  
Contribution percentage to defined contribution plan   100.00%  
Central Pension Fund of the International Union of Operating [Member]      
Information about Plan Assets [Abstract]      
Pension contributions $ 693,000 $ 691,000  
Contribution percentage to defined contribution plan   98.00%  
[1] The 2021 discount rate for benefit cost is 2.8% for the Kirby Pension Plan and 2.9% for the Higman Pension Plan. The 2020 discount rate for benefit cost is 3.5% for the Kirby Pension Plan and 3.1% for the Higman Pension Plan.