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Basis of Presentation and General Information (General) (Details)
 1 Months Ended 9 Months Ended
Jan. 31, 2020
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Dec. 31, 2019
USD ($)
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Basis of Presentation and General Information    
Total number of vessels   23
Number of fuel-efficient ECO-design VLGCs having 84,000 cbm   19
Number of VLGCs having 82,000 cbm   3
Number of time chartered-in VLGC   1
The number of vessels that have exhaust gas cleaning systems   6
Number of VLGCs with scrubber purchase commitments that were in-process | $   $ 2
Number of VLGCs with scrubber purchase commitments that were completed 1 4
Number of VLGCs with scrubber purchase commitments that remain to be installed   4