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Commitments and Contingencies - Legal Proceedings (Detail) - Maximum $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Maurepas Project Dispute
Loss Contingencies [Line Items]
Reasonable possible loss	$ 22.0
Lorenzo Benton v Telecom Network Specialists Inc
Loss Contingencies [Line Items]
Damages sought	11.1
Reasonable possible loss	$ 11.1

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+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
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