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Commitments and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Corporate Joint Venture [Member] | Other Commitments, Engineering, Procurement and Construction Electric Transmission Project [Member]
Other Commitments [Line Items]
Return of capital from unconsolidated affiliates anticipated for 2017	$ 43.5

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- Definition

Forecasted returns of capital from unconsolidated affiliates in two years.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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