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Summary of Net Properties and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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- Definition

Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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