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Revenues (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Abstract]        
Revenues by major source $ 559,624,000 $ 541,159,000 $ 1,056,474,000 $ 1,185,085,000
Revenue recognized     39,181,000 33,693,000
Marine Transportation [Member]        
Disaggregation of Revenue [Abstract]        
Revenues by major source 332,887,000 380,987,000 633,838,000 784,244,000
Marine Transportation [Member] | Inland Transportation [Member]        
Disaggregation of Revenue [Abstract]        
Revenues by major source 253,588,000 303,012,000 478,039,000 621,577,000
Marine Transportation [Member] | Coastal Transportation [Member]        
Disaggregation of Revenue [Abstract]        
Revenues by major source 79,299,000 77,975,000 155,799,000 162,667,000
Distribution and Services [Member]        
Disaggregation of Revenue [Abstract]        
Revenues by major source 226,737,000 160,172,000 422,636,000 400,841,000
Distribution and Services [Member] | Commercial and Industrial [Member]        
Disaggregation of Revenue [Abstract]        
Revenues by major source 140,966,000 129,548,000 273,874,000 291,539,000
Distribution and Services [Member] | Oil and Gas [Member]        
Disaggregation of Revenue [Abstract]        
Revenues by major source $ 85,771,000 $ 30,624,000 $ 148,762,000 $ 109,302,000