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Revenue - Schedule of Marine Segment Revenue (Details) - Marine Services
$ in Thousands
Sep. 30, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 3 months
Remaining performance obligations $ 34,315
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 60 months
Remaining performance obligations $ 283,587
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 39,844
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 357,746
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 18,260
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 267,160
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 39,844
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 325,264
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 10,104
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 10,104
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 4,090
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 16,427
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 20,517
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 1,861
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 1,861