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Summary of Properties and Equipment (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Property Plant And Equipment [Abstract] |  |
Vessels and related equipment | $ 1,132,307 | $ 1,144,028
Other properties and equipment | 8,267 | 7,455
Properties and equipment, gross | 1,140,574 | 1,151,483
Less accumulated depreciation and amortization | 117,788 | 61,626
Properties and equipment, net | $ 1,022,786 | $ 1,089,857

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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