Quarterly report pursuant to Section 13 or 15(d)

Commitment And Contingencies (Details)

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Commitment And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 9 Months Ended 3 Months Ended
Oct. 31, 2011
Sep. 30, 2011
Dec. 31, 2011
Sovran HHF Storage Holdings II LLC [Member]
Commitment And Contingencies [Line Items]      
Consideration paid for facility   $ 4.6  
Facility acquisition cost 5.7    
Percentage ownership of joint venture 15.00%    
Cash contributed to the joint venture     $ 0.9