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Summary of Impairments (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Vessel
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Vessel
Asset Impairment Charges [Abstract]        
Number of vessels impaired in the period | Vessel   15   30
Amount of impairment incurred | $ [1] $ 5,224 $ 16,853 $ 5,224 $ 24,254
[1] Refer to Note (14) for additional information regarding asset impairment charges.