Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Parenthetical) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Jul. 23, 2021	Jun. 01, 2021	Dec. 31, 2020	Dec. 20, 2018
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage			50.00%	50.00%		49.00%
Maximum
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage		50.00%			50.00%
Minimum [Member]
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage		20.00%
General Partner
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage		66.70%
OSV Partners
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage	[1]	30.40%
OSV Partners | Limited Partner
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage		29.70%
Mexmar Offshore International | Equity Method Investments
Schedule Of Investments [Line Items]
Investment, distribution exceeded		$ 9.4

[1] ^{The Company owned 66.7% of the General Partner and 29.7% of the limited partnership interest of OSV Partners I. On December 31, 2021, the Company purchased the remaining shares in this joint venture that it did not own and consolidated the net assets of OSV Partners. See details below as well as “Note 3. Business Acquisitions”.}