Withdrawal Of Proposed Divestiture Of Enova (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Withdrawal Of Proposed Divestiture Of Enova [Abstract]
Offering Cost Incurred	$ 3.9

Includes offering costs of open-end investment companies, and closed-end funds with a continuous offering period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration