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Income Taxes (Narrative) (Detail) | 3 Months Ended
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Mar. 31, 2016
Income Taxes [Line Items] |
Bonus Depreciation For Tax Purposes | 50.00%
Bonus Depreciation for Tax Purposes 2018 | 40.00%
Bonus Depreciation for Tax Purposes 2019 | 30.00%
Current ITC rate for qualified property | 30.00%
2020 ITC rate for qualified property | 26.00%
2021 ITC rate for qualified property | 22.00%

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