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Summary of Properties and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
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