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Summary of Vessels and ROVs Impaired, Amount of Impairment Incurred and Combined Fair Value of Assets after Impairment Charges (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2017 USD ($) Vessel Vehicle | Mar. 31, 2016 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel
Asset Impairment Charges [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of vessels impaired during the period | Vessel |  |  |  |  |  |  |  |  | 132 | 58 | 12
Number of ROVs impaired during the period | Vehicle |  |  |  |  |  |  |  |  | 8 |  |
Amount of impairment incurred | $ 64,857 | $ 253,422 | $ 129,562 | $ 36,886 | $ 55,540 | $ 15,141 | $ 31,672 | $ 14,958 | $ 484,727 | $ 117,311 | $ 14,525
Combined fair value of assets incurring impairment after having recorded impairment charges |  |  |  |  |  |  |  |  | $ 933,068 | $ 422,655 | $ 28,509

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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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