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Summaries of Net Properties and Equipment (Detail) $ in Thousands | Mar. 31, 2017 USD ($) Vessel | Mar. 31, 2016 USD ($) Vessel
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Vessels and related equipment |  | $ 3,407,760 | $ 4,666,749
Other properties and equipment |  | 69,670 | 92,065
Properties and equipment, gross |  | 3,477,430 | 4,758,814
Less accumulated depreciation and amortization |  | 612,668 | 1,207,523
Net properties and equipment |  | $ 2,864,762 | $ 3,551,291
Number Of Vessels | Vessel |  | 244 | 253
Owned Vessels in Active Service |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net properties and equipment |  | $ 1,990,049 | $ 2,510,418
Number Of Vessels | Vessel |  | 143 | 180
Stacked Vessels |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net properties and equipment |  | $ 793,606 | $ 794,126
Number Of Vessels | Vessel |  | 101 | 73
Marine Equipment and Other Assets Under Construction |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net properties and equipment |  | $ 53,611 | $ 185,380
Other Property Plant and Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net properties and equipment | [1] | $ 27,496 | $ 61,367
[1] | Other property and equipment includes eight remotely operated vehicles.

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