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Investment in Unconsolidated Companies (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
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Sonatide 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 | $ 37,141 | $ 63,893
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 | $ 361 | 1,951
Sonatide Marine Ltd and DTDW Holdings Ltd. |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in, at equity, and advances to unconsolidated companies | $ 37,502 | $ 65,844

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