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Summary of Net Properties and Equipment (Detail) $ in Thousands | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($) Vessel
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |  |
Vessels and related equipment |  | $ 836,773 | $ 850,268 |
Other properties and equipment |  | 5,481 | 5,710 |
Properties and equipment, gross |  | 842,254 | 855,978 |
Less accumulated depreciation and amortization |  | 38,529 | 18,458 |
Net properties and equipment |  | $ 803,725 | $ 837,520 |
Number Of Vessels | Vessel | [1] |  | 227 |
Owned Vessels in Active Service |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment |  |  | $ 632,978 |
Number Of Vessels | Vessel | [1] |  | 138 |
Stacked Vessels |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment |  |  | $ 189,710 |
Number Of Vessels | Vessel | [1] |  | 89 |
Marine Equipment and Other Assets Under Construction |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment |  |  | $ 9,501 |
Other Property Plant and Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment | [2] |  | $ 5,331 |
Predecessor |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Vessels and related equipment |  |  |  | $ 3,407,760
Other properties and equipment |  |  |  | 69,670
Properties and equipment, gross |  |  |  | 3,477,430
Less accumulated depreciation and amortization |  |  |  | 612,668
Net properties and equipment |  |  |  | $ 2,864,762
Number Of Vessels | Vessel | [1] |  |  | 244
Predecessor | Owned Vessels in Active Service |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment |  |  |  | $ 1,990,049
Number Of Vessels | Vessel | [1] |  |  | 143
Predecessor | Stacked Vessels |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment |  |  |  | $ 793,606
Number Of Vessels | Vessel | [1] |  |  | 101
Predecessor | Marine Equipment and Other Assets Under Construction |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment |  |  |  | $ 53,611
Predecessor | Other Property Plant and Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net properties and equipment | [2] |  |  | $ 27,496
[1] | Vessel count excludes vessels operated under sale leaseback agreements.
[2] | Other property and equipment at March 31, 2017 includes eight remotely operated vehicles, all of which were sold in December 2017.

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