Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.19.3.a.u2
Commitments and Contingencies - Additional Information (Details)
$ in Millions
Dec. 31, 2019
USD ($)
vessel
Dec. 31, 2018
USD ($)
Mar. 31, 2018
vessel
Commitments And Contingencies Disclosure [Abstract]      
Number of multi-purpose service vessels | vessel 2   2
Net contract asset | $ $ 12.5 $ 12.5