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Summary of Properties and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Vessels and related equipment	$ 1,137,591	$ 1,144,028
Other properties and equipment	7,898	7,455
Properties and equipment, gross	1,145,489	1,151,483
Less accumulated depreciation and amortization	80,192	61,626
Properties and equipment, net	$ 1,065,297	$ 1,089,857

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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