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Debt Obligations - DBMG and Marine Services Credit Facilities (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 24, 2018
USD ($)
Apr. 05, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
Sep. 30, 2018
USD ($)
Sep. 21, 2018
USD ($)
Sep. 21, 2018
GBP (£)
Apr. 04, 2018
USD ($)
Apr. 04, 2018
GBP (£)
Jan. 11, 2018
Nov. 30, 2017
USD ($)
DBMG | LIBOR plus 2.25% Notes, due in 2024                      
Line of Credit Facility [Line Items]                      
Outstanding debt     $ 2,400,000   $ 2,400,000            
DBMG | Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Line of credit, maximum amount     50,000,000.0   50,000,000.0            
Line of credit outstanding amount     37,300,000   37,300,000            
Increase to current borrowing capacity $ 10,000,000.0                    
DBMG | Letter of Credit                      
Line of Credit Facility [Line Items]                      
Line of credit, maximum amount     14,500,000.0   14,500,000.0            
Outstanding letters of credit     8,500,000   8,500,000            
DBMG | Real Estate Term Advance | Note Payable Collateralized by Real Estate                      
Line of Credit Facility [Line Items]                      
Outstanding debt     2,300,000   2,300,000            
DBMG | Real Estate Term Advance | Revolving Credit Facility | LIBOR plus 2.25% Notes, due in 2024                      
Line of Credit Facility [Line Items]                      
Line of credit, maximum amount     $ 10,000,000   10,000,000            
DBMG | Real Estate Term Advance | Revolving Credit Facility | Note Payable Collateralized by Real Estate                      
Line of Credit Facility [Line Items]                      
Proceeds from note payable collateralized (up to)         $ 15,000,000.0            
DBMG | Real Estate Term Advance | Revolving Credit Facility | Senior Notes Due 2025                      
Line of Credit Facility [Line Items]                      
Line of credit, maximum amount   $ 70,000,000.0                  
Line of credit outstanding amount   $ 17,000,000                  
GMSL | Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Line of credit, maximum amount               $ 9,400,000.0 £ 7,200,000.0    
Interest rate (as a percent)               7.49% 7.49%    
GMSL | Revolving Credit Facility | Senior Notes Due 2019                      
Line of Credit Facility [Line Items]                      
Line of credit, maximum amount           $ 14,400,000.0 £ 11,000,000.0        
LIBOR | DBMG | Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate (as a percent) 2.50%     2.00%              
LIBOR | DBMG | Real Estate Term Advance | Revolving Credit Facility | LIBOR plus 2.25% Notes, due in 2024                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate (as a percent)         2.50%            
LIBOR | DBMG | Real Estate Term Advance | Revolving Credit Facility | Senior Notes Due 2023                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate (as a percent)   1.50%                  
LIBOR | DBMG | Real Estate Term Advance | Revolving Credit Facility | Senior Notes Due 2024                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate (as a percent)   2.25%                  
Subsidiary Of Fugro N.V. (AMS:FUR) | GMSL                      
Line of Credit Facility [Line Items]                      
Interest rate (as a percent)     10.00%   10.00%         4.00%  
Short-term loan                     $ 7,500,000
Debt instrument, term         363 days            
Interest expense on note     $ 200,000   $ 600,000