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Investment in Unconsolidated Companies (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Sonatide Marine, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage in unconsolidated affiliates	49.00%	49.00%
Investments in, at equity, and advances to unconsolidated companies		$ 26,935
DTDW Holdings, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage in unconsolidated affiliates	40.00%
Investments in, at equity, and advances to unconsolidated companies	$ 1,033	2,281
GulfMark Marine, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage in unconsolidated affiliates	49.00%
Investments in, at equity, and advances to unconsolidated companies	$ 6
Sonatide Marine Ltd and DTDW Holdings Ltd.
Schedule of Equity Method Investments [Line Items]
Investments in, at equity, and advances to unconsolidated companies	$ 1,039	$ 29,216

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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+ References

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-Topic 323
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