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Asset Impairments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Vessel | Dec. 31, 2015 USD ($) Vessel | Dec. 31, 2016 USD ($) Vessel | Dec. 31, 2015 USD ($) Vessel | Mar. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Asset impairments | [1] | $ 253,422 | $ 15,141 | $ 419,870 | $ 61,771 |
Number of vessels impaired during the period | Vessel |  | 74 | 14 | 115 | 47 |
Fair value of assets incurring impairment |  | $ 523,495 | $ 90,010 | $ 813,851 | $ 244,310 |
Net book value of assets |  | 3,009,407 |  | 3,009,407 |  | $ 3,551,291
Total carrying value of vessels |  | 4,204,048 |  | $ 4,204,048 |  | $ 4,666,749
Stacked Vessels and Other Assets |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Asset impairments |  | $ 84,100 |  |  |  |
Number of vessels impaired during the period | Vessel |  | 26 |  |  |  |
Fair value of assets incurring impairment |  | $ 219,900 |  |  |  |
Number of vessels stacked | Vessel |  | 80 |  | 80 |  |
Net book value of assets |  | $ 752,300 |  | $ 752,300 |  |
Active Vessels |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Asset impairments |  | $ 169,300 |  |  |  |
Number of vessels impaired during the period | Vessel |  | 48 |  |  |  |
Fair value of assets incurring impairment |  | $ 303,600 |  |  |  |
Net book value of assets |  | $ 1,600,000 |  | $ 1,600,000 |  |
Number of vessels active | Vessel |  | 92 |  | 92 |  |
Stacked and Active Vessels |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Number of vessels operating | Vessel |  | 246 |  | 246 |  |
Total carrying value of vessels |  | $ 2,900,000 |  | $ 2,900,000 |  |
[1] | Refer to Note (15) for additional information regarding asset impairment charges.

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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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