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Schedule of Vessel Commitments (Parenthetical) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 31, 2017 Vessel
Option Agreement |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels under construction | Vessel |  | 2
Novation Agreement | Subsequent Event |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Net consideration received from third party | $ 5.3 |
Contractual obligation future payments | $ 27.2 |

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- Definition Contractual obligation future payments. + References No definition available. + Details
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X
- Definition Significant Purchase and Supply Commitment [Line Items] + References No definition available. + Details
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- Details
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X
- Details
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- Details
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