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Commitments and Contingencies - Legal Proceedings (Detail) - Maximum $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Maurepas Project Dispute
Loss Contingencies [Line Items]
Reasonably possible amount of loss	$ 22.0
Lorenzo Benton v Telecom Network Specialists Inc
Loss Contingencies [Line Items]
Reasonably possible amount of loss	11.1
Damages sought	$ 11.1

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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