Income Taxes (Details)	Sep. 30, 2012 item
Income Taxes
Number of states in which the entity primarily operates or has operated and has income tax nexus	3

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant