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Segment Data (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Data [Abstract]                      
Number of Reportable Segments | Segment                 2    
Revenues [Abstract]                      
Marine transportation                 $ 1,663,090,000 $ 1,770,684,000 $ 1,713,167,000
Diesel engine services                 484,442,000 795,634,000 529,028,000
Total revenues $ 484,138,000 $ 532,565,000 $ 543,156,000 $ 587,673,000 $ 668,297,000 $ 680,721,000 $ 628,054,000 $ 589,246,000 2,147,532,000 2,566,318,000 2,242,195,000
Segment profit (loss) 80,115,000 90,623,000 93,072,000 97,902,000 108,783,000 122,928,000 121,679,000 101,000,000 361,712,000 454,390,000 408,678,000
Total assets 4,156,266,000       4,141,909,000       4,156,266,000 4,141,909,000 3,682,517,000
Depreciation and amortization                 192,240,000 169,312,000 164,437,000
Capital expenditures                 345,475,000 355,144,000 253,227,000
Other segment disclosures [Abstract]                      
Interest expense (4,280,000) (4,449,000) (4,759,000) (5,250,000) (5,149,000) (5,225,000) (5,469,000) (5,618,000) (18,738,000) (21,461,000) (27,872,000)
Gain on disposition of assets (426,000) 400,000 (91,000) (1,555,000) (156,000) (47,000) (527,000) (51,000) (1,672,000) (781,000) (888,000)
Other income (expense) 9,000 $ 22,000 $ (303,000) $ 60,000 125,000 $ 27,000 $ 123,000 $ (236,000) (663,000) (345,000) 20,000
Details of "Other" total assets [Abstract]                      
Investment in affiliates 2,090,000       2,539,000       2,090,000 2,539,000  
Total assets 4,156,266,000       4,141,909,000       4,156,266,000 4,141,909,000 3,682,517,000
Reporting Segments [Member]                      
Revenues [Abstract]                      
Marine transportation                 1,663,090,000 1,770,684,000 1,713,167,000
Diesel engine services                 484,442,000 795,634,000 529,028,000
Total revenues                 2,147,532,000 2,566,318,000 2,242,195,000
Segment profit (loss)                 361,712,000 454,390,000 408,678,000
Depreciation and amortization                 192,240,000 169,312,000 164,437,000
Capital expenditures                 345,475,000 355,144,000 253,227,000
Marine Transportation [Member] | Reporting Segments [Member]                      
Revenues [Abstract]                      
Segment profit (loss)                 374,842,000 429,864,000 408,255,000
Total assets 3,451,553,000       3,317,696,000       3,451,553,000 3,317,696,000 3,046,692,000
Depreciation and amortization                 175,798,000 154,019,000 149,574,000
Capital expenditures                 311,862,000 340,315,000 237,964,000
Details of "Other" total assets [Abstract]                      
Total assets 3,451,553,000       3,317,696,000       3,451,553,000 3,317,696,000 3,046,692,000
Marine Transportation [Member] | Intersegment Eliminations [Member]                      
Revenues [Abstract]                      
Total revenues                 26,203,000 25,769,000 27,669,000
Segment profit (loss)                 2,620,000 2,577,000 2,767,000
Diesel Engine Services [Member] | Reporting Segments [Member]                      
Revenues [Abstract]                      
Segment profit (loss)                 18,921,000 60,063,000 42,767,000
Total assets 637,549,000       736,129,000       637,549,000 736,129,000 576,472,000
Depreciation and amortization                 12,498,000 11,463,000 11,096,000
Capital expenditures                 28,907,000 7,486,000 4,658,000
Details of "Other" total assets [Abstract]                      
Total assets 637,549,000       736,129,000       637,549,000 736,129,000 576,472,000
Other [Member]                      
Revenues [Abstract]                      
Total assets 67,164,000       88,084,000       67,164,000 88,084,000 59,353,000
Other segment disclosures [Abstract]                      
General corporate expenses                 (14,773,000) (14,896,000) (15,728,000)
Interest expense                 (18,738,000) (21,461,000) (27,872,000)
Gain on disposition of assets                 1,672,000 781,000 888,000
Other income (expense)                 (212,000) 39,000 368,000
Profit (loss) from other segment                 (32,051,000) (35,537,000) (42,344,000)
Details of "Other" total assets [Abstract]                      
General corporate assets 65,074,000       85,545,000       65,074,000 85,545,000 57,197,000
Investment in affiliates 2,090,000       2,539,000       2,090,000 2,539,000 2,156,000
Total assets 67,164,000       88,084,000       67,164,000 88,084,000 59,353,000
Other [Member] | Reporting Segments [Member]                      
Revenues [Abstract]                      
Segment profit (loss)                 (32,051,000) (35,537,000) (42,344,000)
Total assets 67,164,000       88,084,000       67,164,000 88,084,000 59,353,000
Depreciation and amortization                 3,944,000 3,830,000 3,767,000
Capital expenditures                 4,706,000 7,343,000 10,605,000
Details of "Other" total assets [Abstract]                      
Total assets $ 67,164,000       $ 88,084,000       $ 67,164,000 $ 88,084,000 $ 59,353,000