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Commitments and Contingencies - Legal Proceedings (Detail) - Maximum - USD ($) $ in Millions	1 Months Ended
	Feb. 28, 2018	Dec. 31, 2017
Maurepas Project Dispute
Loss Contingencies [Line Items]
Reasonable possible loss		$ 22.0
Lorenzo Benton V Telecom Network Specialists Inc
Loss Contingencies [Line Items]
Reasonable possible loss		$ 11.1
Subsequent Event | Lorenzo Benton V Telecom Network Specialists Inc
Loss Contingencies [Line Items]
Damages sought	$ 11.1

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

+ References

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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