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Summary of Impairments (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Vessel
Asset Impairment Charges [Abstract]    
Number of vessels impaired in the period | Vessel   13
Amount of impairment incurred | $ $ 0 $ 6,186,000 [1]
[1] Refer to Note (14) for additional information regarding asset impairment charges.