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Summary of Net Properties and Equipment (Detail) $ in Thousands | Dec. 31, 2018 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Vessels and related equipment | $ 1,144,028 | $ 863,683
Other properties and equipment | 7,455 | 5,710
Properties and equipment, gross | 1,151,483 | 869,393
Less accumulated depreciation and amortization | 61,626 | 18,458
Net properties and equipment | $ 1,089,857 | $ 850,935
Number Of Vessels | Vessel | 257 | 227
Owned Vessels in Active Service |  |
Property, Plant and Equipment [Line Items] |  |
Net properties and equipment | $ 914,044 | $ 646,393
Number Of Vessels | Vessel | 165 | 138
Stacked Vessels |  |
Property, Plant and Equipment [Line Items] |  |
Net properties and equipment | $ 169,037 | $ 189,710
Number Of Vessels | Vessel | 92 | 89
Marine Equipment and Other Assets Under Construction |  |
Property, Plant and Equipment [Line Items] |  |
Net properties and equipment | $ 795 | $ 9,501
Other Property Plant and Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Net properties and equipment | $ 5,981 | $ 5,331

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