XML 31 R30.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Regulatory Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | $ 13.1 | $ 9.7 | $ 11.6
Regulatory Tracker Mechanisms |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory Liabilities | $ 13.1 | $ 9.7 | $ 11.6

X
- Details
Name: | us-gaap_RegulatoryLiabilitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant