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Summary of Properties and Equipment (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Property Plant And Equipment [Abstract] |  |
Vessels and related equipment | $ 1,131,893 | $ 1,144,028
Other properties and equipment | 8,110 | 7,455
Properties and equipment, gross | 1,140,003 | 1,151,483
Less accumulated depreciation and amortization | 98,949 | 61,626
Properties and equipment, net | $ 1,041,054 | $ 1,089,857

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