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100580 - Disclosure - Summary Of Changes In Asset Retirement Obligations (Detail)
(http://www.accessmidstream.com/20131231/taxonomy/role/DisclosureSummaryOfChangesInAssetRetirementObligationsDetail)
TableRecorded Unconditional Purchase Obligation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001483096 (http://www.sec.gov/CIK)
Legal Entity [Axis]Entity [Domain]
Recorded Unconditional Purchase Obligation [Line Items]Period [Axis]
2013-01-01 - 2013-12-31
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
Asset retirement obligations, beginning of period
5,335,000  
3,409,000  
2,878,000  
Additions
 
1,816,000  
131,000  
Revisions
(1,314,000) 
(133,000) 
193,000  
Accretion expense
500,000  
243,000  
207,000  
Deletions
xsi:nil  
xsi:nil  
xsi:nil  
Asset retirement obligations, end of period
4,521,000  
 
5,335,000  
 
3,409,000