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Summary of Combined Fair Value of Assets Incurred Impairments (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Vessel Vehicle | Sep. 30, 2015 USD ($) Vessel | Sep. 30, 2016 USD ($) Vessel Vehicle | Sep. 30, 2015 USD ($) Vessel
Asset Impairment Charges [Abstract] |  |  |  |  |
Number of vessels impaired during the period | Vessel |  | 42 | 19 | 54 | 33
Number of ROVs impaired during the period | Vehicle |  | 8 |  | 8 |
Amount of impairment incurred | [1] | $ 129,562 | $ 31,672 | $ 166,448 | $ 46,630
Combined fair value of assets incurring impairment |  | $ 322,550 | $ 107,445 | $ 477,950 | $ 154,300
[1] | Refer to Note (15) for additional information regarding asset impairment charges.

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- Definition Number of remotely operated vehicles impaired during period. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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