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Revenue - Schedule of Marine Segment Revenue (Details) - Marine Services
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 1 year
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 5 years
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 1 year
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 5 years
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 1 year
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 5 years
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 1 year
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 5 years
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period