Goodwill and Intangible Assets Additional Information (Details)	12 Months Ended
Dec. 31, 2011 Trade names and trademarks	Dec. 31, 2012 Minimum Non-compete agreements	Dec. 31, 2012 Maximum Non-compete agreements	Dec. 31, 2012 Maximum Trade names and trademarks
Useful Life	10 years 0 months	2 years 6 months	5 years	10 years 0 months

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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