Segment Information (Details Textual)	12 Months Ended
Dec. 31, 2011	Mar. 31, 2012 BusinessSegment
Segment Information (Textual) [Abstract]
Number of principal business segments of Company		5
Period for revenue recognition	one year or less

A description of whether the adoption of the guidance is expected to have a material effect on the financial statements in the periods after initial adoption.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 25

-Section 65

-Paragraph 1

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=6940631&loc=SL6749767-165964

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 605

-Section 65

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6751208&loc=SL6751214-165967

Name:	us-gaap_RevenueRecognitionNewAccountingPronouncementMaterialEffectDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration