Equipment Acquisitions and Dispositions - Additional Information (Details)			12 Months Ended
	Jan. 12, 2021 USD ($)	Jan. 12, 2021 GBP (£)	Dec. 31, 2021 USD ($) Vessel		Dec. 31, 2020 USD ($) Vessel		Dec. 31, 2019 USD ($) Vessel	Dec. 31, 2019 GBP (£) Vessel
Property Plant And Equipment [Line Items]
Capital expenditures and payments on equipment			$ 7,000,000.0		$ 20,800,000		$ 44,800,000
Issuance of stock			$ 10,000
Acquired			1	[1]	4	[2]	4	4
Proceeds from sale of business			$ 30,137,000		$ 20,674,000		$ 55,321,000
Property plant equipment consideration transferred			30,100,000
Net book value			723,518,000		753,662,000
ERRV Fleet Business
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment							(9,100,000)
Proceeds from sale of business							27,390,000
Net book value							23,400,000
Additional consideration			0		$ 0		5,200,000	£ 4,000,000.0
North Sea ERRV Fleet
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment							5,500,000
Proceeds from deposits							1,100,000
Proceeds from sale of property, plant, and equipment, including deposits							55,300,000
Proceeds from sale of property, plant, and equipment, excluding deposits for future vessel sales							$ 54,200,000
Falcon Global U S A Term Loan Facility
Property Plant And Equipment [Line Items]
Reduced of debt under credit facility			$ 22,500,000
Crew Transfer Vessels
Property Plant And Equipment [Line Items]
Sale of equity percentage	100.00%	100.00%
Aggregate purchase price | £		£ 32,800,000
Issuance of stock	$ 42,600,000
Debt outstanding under revolving credit facility | £		£ 20,400,000
Acquired | Vessel					41
Number of additional joint ventures held interests | Vessel					5
Windcat Workboats
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment	22,756,000
Proceeds from sale of business	$ 38,715,000
Vessel Under Construction
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment					$ 1,200,000
Proceeds from property, plant, and equipment, including deposits and gain on sale					21,600,000
Proceeds from sale of business					20,700,000
Proceeds from deposits					$ 900,000
Vessel under Construction and Other Equipment
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel					1
Anchor Handling Towing Supply
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel					2
Anchor Handling Towing Supply | North Sea ERRV Fleet
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel							1	1
Specialty Vessel
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel					1
Fast Support Vessels
Property Plant And Equipment [Line Items]
Acquired							2	2
Number of equipment sold | Vessel			3		4
Fast Support Vessels | North Sea ERRV Fleet
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel							5	5
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel			1
Platform Supply Vessels | North Sea ERRV Fleet
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel							5	5
Platform Supply Vessels And Fast Support Vessels
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment			$ 20,900,000
Proceeds from sale of business			$ 25,000,000.0
Vessels | ERRV Fleet Business
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel							18	18
Liftboats | North Sea ERRV Fleet
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel							3	3

[1] Excludes five PSVs acquired as part of the OSV Partners Acquisition (see “Note 3. Business Acquisitions”).

[2] Excludes three CTVs as assets held for sale and seven PSVs acquired as part of the SEACOSCO Acquisition (see “Note 3. Business Acquisitions”).