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Revenue - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) provider	Dec. 31, 2017 USD ($)
Construction
Revenue from External Customer [Line Items]
Change in contract assets costs in excess of billings, new commercial contracts	$ 45,800	$ 45,800
Change in contract assets costs in excess of billings, transfer to receivables	23,400	23,400
Change in contract liabilities costs in excess of billings, new commercial contracts	53,300	53,300
Change in contract liabilities costs in excess of billings, transfer to receivables	29,400	29,400
Contract liabilities	$ 53,796	$ 53,796	$ 29,862
Marine Services
Revenue from External Customer [Line Items]
Percent of revenue recognized	77.00%	73.00%
Contract liabilities	$ 2,642	$ 2,642	3,106
Energy
Revenue from External Customer [Line Items]
Revenue after customer rebates tax credits		2,600
Broadcasting
Revenue from External Customer [Line Items]
Contract liabilities	$ 1,400	$ 1,400	$ 1,600
Telecommunication - Maintenance | Marine Services
Revenue from External Customer [Line Items]
Number of global telecommunications providers | provider		60
Telecommunication - Maintenance | Marine Services | Minimum
Revenue from External Customer [Line Items]
Term of contract		5 years
Telecommunication - Maintenance | Marine Services | Maximum
Revenue from External Customer [Line Items]
Term of contract		7 years
Telecommunication - Installation | Marine Services | Minimum
Revenue from External Customer [Line Items]
Term of contract		1 month
Telecommunication - Installation | Marine Services | Maximum
Revenue from External Customer [Line Items]
Term of contract		5 months

X

- Definition

Contract With Customer,

+ References

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- Definition

Contract with Customer, Asset, Costs In Excess Of Billings, Commercial Projects

+ References

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- Definition

Contract with Customer, Asset, Costs In Excess Of Billings, Transfers To Receivables

+ References

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- Definition

Number Of Global Telecommunications Providers

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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