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Investment in Unconsolidated Companies (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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