Basis Of Presentation (Details)	12 Months Ended
Dec. 31, 2012
Basis of Presentation [Abstract]
Atlas Resources Public #18-2009 (B) L.P. Formation Date	Apr. 08, 2008

Date the limited liability company (LLC) or limited partnership (LP) was formed, in CCYY-MM-DD format.

No definition available.

Name:	us-gaap_LimitedLiabilityCompanyOrLimitedPartnershipBusinessFormationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration