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Income Taxes (Narrative) (Detail)
 3 Months Ended
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%