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Segment Reporting - Revenue and Income from Vessel Operations by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue $ 1,220,374 $ 1,464,975 $ 1,190,184
Operating Income (Loss) 365,247 531,725 245,766
General and administrative expenses (61,058) (57,590) (57,552)
Restructuring charges (5,632) (1,677) (11,579)
Income (Loss) from Equity Method Investments 2,767 3,432 244
Interest Expense (7,542) (28,009) (38,580)
Interest income 37,218 24,128 6,689
Other - net (note 17) 4,334 (1,691) (3,066)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 402,024 529,585 211,053
Voyage expenses 405,546 474,371 495,604
Operating Costs and Expenses (252,594) (241,585) (275,139)
Operating Lease, Expense (74,795) (70,836) (27,374)
Depreciation, Depletion and Amortization (93,582) (97,551) (99,033)
Gain on sale and write-down of assets (note 15) 38,080 10,360 21,863
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
General and administrative expenses (320)    
Restructuring charges 320    
Tankers [Member] | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 1,106,278 1,364,452 1,063,111
Operating Income (Loss) 365,461 535,910 255,949
General and administrative expenses (48,833) (45,936) (41,769)
Restructuring charges (5,952) (1,248) (1,822)
Income (Loss) from Equity Method Investments 2,767 3,432 244
Voyage expenses 405,546 474,371 495,604
Operating Costs and Expenses (150,605) (148,960) (150,448)
Operating Lease, Expense (74,379) (70,836) (27,374)
Depreciation, Depletion and Amortization (93,582) (97,551) (99,033)
Gain on sale and write-down of assets (note 15) 38,080 10,360 8,888
Marine Services and Other | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 114,096 100,523 127,073
Operating Income (Loss) (214) (4,185) (10,183)
General and administrative expenses (11,905) (11,654) (15,783)
Restructuring charges 0 (429) (9,757)
Voyage expenses 0 0 0
Operating Costs and Expenses (101,989) (92,625) (124,691)
Operating Lease, Expense (416) 0 0
Depreciation, Depletion and Amortization 0 0 0
Gain on sale and write-down of assets (note 15) $ 0 $ 0 $ 12,975