Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.19.1
Commitments and Contingencies - Additional Information (Details)
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Commitments And Contingencies [Line Items]    
Remaining capital commitment $ 85.7  
Unrecorded unconditional purchase obligation, due in remainder of fiscal year 54.0  
Unrecorded unconditional purchase obligation, due within two years 31.7  
Unrecorded unconditional purchase obligation, due within three years 20.2  
Amount guaranteed under arrangement $ 36.6  
SEACOR Holdings    
Commitments And Contingencies [Line Items]    
Related party transaction, rate 0.50%  
Line of Credit | Performance Guarantee    
Commitments And Contingencies [Line Items]    
Amount guaranteed under arrangement | €   € 0.9
Fast Support Vessels    
Commitments And Contingencies [Line Items]    
Unrecorded unconditional purchase obligation, maximum quantity 1 1
Supply Vessels    
Commitments And Contingencies [Line Items]    
Unrecorded unconditional purchase obligation, maximum quantity 2 2
Crew Transfer Vessels    
Commitments And Contingencies [Line Items]    
Unrecorded unconditional purchase obligation, maximum quantity 3 3
Platform Supply Vessels    
Commitments And Contingencies [Line Items]    
Unrecorded unconditional purchase obligation, maximum quantity 3 3