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Derivative Instruments and Hedging Strategies - Additional Information (Details)

v3.19.1
Derivative Instruments and Hedging Strategies - Additional Information (Details) - Interest Rate Swap
€ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
OSV Partners    
Derivative [Line Items]    
Derivative, number of instruments held, total 2 2
Derivative, notional amount $ 26.6  
OSV Partners | Minimum    
Derivative [Line Items]    
Derivative, fixed interest rate 1.89% 1.89%
OSV Partners | Maximum    
Derivative [Line Items]    
Derivative, fixed interest rate 2.27% 2.27%
Cash Flow Hedging | Designated as Hedging Instrument | Windcat Workboats Holdings Ltd    
Derivative [Line Items]    
Derivative, number of instruments held, total 2 2
Derivative, fixed interest rate 0.03% 0.03%
Derivative, notional amount $ 16.9 € 15.0
Cash Flow Hedging | Designated as Hedging Instrument | SEACOR Marine Foreign Holdings    
Derivative [Line Items]    
Derivative, fixed interest rate 3.32% 3.32%
Derivative, notional amount $ 9.5  
Cash Flow Hedging | Designated as Hedging Instrument | SMFH    
Derivative [Line Items]    
Derivative, fixed interest rate 3.195% 3.195%
Derivative, notional amount $ 52.7  
Cash Flow Hedging | Designated as Hedging Instrument | SEACOR 88/888    
Derivative [Line Items]    
Derivative, fixed interest rate 3.20% 3.20%
Derivative, notional amount $ 5.5  
Cash Flow Hedging | Designated as Hedging Instrument | MexMar    
Derivative [Line Items]    
Derivative, number of instruments held, total 5 5
Derivative, notional amount $ 94.4  
Cash Flow Hedging | Designated as Hedging Instrument | MexMar | Minimum    
Derivative [Line Items]    
Derivative, fixed interest rate 1.71% 1.71%
Cash Flow Hedging | Designated as Hedging Instrument | MexMar | Maximum    
Derivative [Line Items]    
Derivative, fixed interest rate 2.10% 2.10%