Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Legal Proceedings (Detail)

v3.10.0.1
Commitments and Contingencies - Legal Proceedings (Detail) - Maximum
$ in Millions
6 Months Ended
Jun. 30, 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]  
Reasonable possible loss 11.1
Damages sought $ 11.1