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Commitments and Contingencies (Legal Proceedings) - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Apr. 21, 2010 mi
Maximum [Member] | Lorenzo Benton v Telecom Network Specialists Inc [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Reasonable possible loss |  | $ 23,000,000 |
Sunrise Powerlink Project [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Length of electrical transmission line to be constructed under contract | mi |  |  | 117
Proceeds from customers | $ 65,000,000 |  |

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