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Nature of Operations and Accounting Policies - Summary of Property and Equipment from Continuing Operations (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Historical cost $ 967,683 [1] $ 1,008,080 [1] $ 1,012,873
Accumulated depreciation (310,778) (302,328) (291,538)
Net book value 656,905 705,752 $ 721,335
Offshore Support Vessels, Anchor Handling Towing Supply      
Historical cost [1],[2] 27,281 49,632  
Accumulated depreciation [2] (18,139) (33,200)  
Net book value [2] 9,142 16,432  
Fast Support Vessels      
Historical cost [1],[3] 354,473 362,309  
Accumulated depreciation [3] (130,599) (116,878)  
Net book value [3] 223,874 245,431  
Platform Supply Vessels      
Historical cost [1],[4] 295,875 282,243  
Accumulated depreciation [4] (36,112) (20,613)  
Net book value [4] 259,763 261,630  
Offshore Support Vessels, Specialty      
Historical cost [1] 3,163 3,163  
Accumulated depreciation (3,138) (3,138)  
Net book value 25 25  
Offshore Support Vessels, Liftboats      
Historical cost [1] 264,142 289,283  
Accumulated depreciation (102,156) (108,364)  
Net book value 161,986 180,919  
General Machinery and Spares      
Historical cost [1] 10,148 8,814  
Accumulated depreciation (8,565) (8,463)  
Net book value 1,583 351  
Property, Plant and Equipment, Other Types      
Historical cost [1],[5] 12,601 12,636  
Accumulated depreciation [5] (12,069) (11,672)  
Net book value [5] $ 532 $ 964  
[1] Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Some of the Company’s vessels are pledged as security for certain loans.
[2] Anchor Handling Towing Supply vessels (“AHTS”).
[3] Fast support vessels (“FSVs”).
[4] Platform support vessels (“PSVs”).
[5] Includes buildings, leasehold improvements, vehicles and other property and equipment.