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Summary of Impairments (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Vessel
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Vessel
Asset Impairment Charges [Abstract]        
Number of vessels impaired in the period | Vessel   2   15
Amount of impairment incurred | $ $ 0 $ 1,215,000 [1] $ 0 $ 7,401,000 [1]
[1] Refer to Note (14) for additional information regarding asset impairment charges.