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Summary of Net Properties and Equipment (Detail) $ in Thousands | Mar. 31, 2016 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Number Of Vessels | Vessel |  | 253 | 263
Carrying Value |  | $ 3,551,291 | $ 3,746,307
Owned Vessels in Active Service |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number Of Vessels | Vessel |  | 180 | 242
Carrying Value |  | $ 2,510,418 | $ 3,310,476
Stacked Vessels |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number Of Vessels | Vessel |  | 73 | 21
Carrying Value |  | $ 794,126 | $ 38,489
Marine Equipment and Other Assets Under Construction |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Carrying Value |  | 185,380 | 315,552
Other Property Plant and Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Carrying Value | [1] | $ 61,367 | $ 81,790
[1] | Other property and equipment includes eight remotely operated vehicles.

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