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Revenue - Additional Information (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2024
EUR (€)
contract
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Revenue      
Revenue - Lease component included within time charter services and transportation and installation. € 85,000 € 79,000 € 91,000
Total revenue € 248,738 108,622 106,424
Revenue from time charter contracts, Number of activities | contract 2    
Transportation and installation revenue, Number of activities | contract 2    
Percentage of contract backlog 100.00%    
Subject to exercise of counterparty options (non-contingent)      
Revenue      
Percentage of contract backlog 50.00%    
Subject to exercise of counterparty options (contingent)      
Revenue      
Percentage of contract backlog 50.00%    
Revenue exceeded 10% of total revenue - Customer 1      
Revenue      
Total revenue € 60,000 44,500 52,400
Revenue exceeded 10% of total revenue - Customer 2      
Revenue      
Total revenue 58,000 28,500 € 53,200
Revenue exceeded 10% of total revenue - Customer 3      
Revenue      
Total revenue 56,000 € 22,700  
Revenue exceeded 10% of total revenue - Customer 4      
Revenue      
Total revenue € 36,000    
Europe      
Revenue      
Percentage of entity's revenue 50.00% 100.00% 100.00%
Rest of the world      
Revenue      
Percentage of entity's revenue 50.00%