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Environmental Obligations Recognized by Company (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Site Contingency [Line Items]
Environmental obligations, current	$ 5.3	$ 1.0	$ 1.1
Environmental obligations, noncurrent	2.0	13.8	13.8
Total Environmental Obligations	7.3	14.8	14.9
Northern Utilities Inc
Site Contingency [Line Items]
Environmental obligations, current	1.2	1.0	1.1
Environmental obligations, noncurrent	2.0	1.8	1.8
Fitchburg Gas and Electric Light Company
Site Contingency [Line Items]
Environmental obligations, current	4.1
Environmental obligations, noncurrent		$ 12.0	$ 12.0

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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