Intangible Assets (Details Textual)	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Long-term franchise agreements and contracts [Member]
Finite Lived Intangible Assets (Textual) [Abstract]
Weighted average amortization period of acquired intangible assets	7 years 2 months 27 days	22 years 4 months 4 days
Customer lists [Member]
Finite Lived Intangible Assets (Textual) [Abstract]
Weighted average amortization period of acquired intangible assets	9 years 4 months 29 days	6 years 10 months 23 days
Other [Member]
Finite Lived Intangible Assets (Textual) [Abstract]
Weighted average amortization period of acquired intangible assets		40 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration