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Subsequent Event (Details) (Subsequent event, Blackstone Funds, USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Mar. 22, 2013
Subsequent event | Blackstone Funds
 
Subsequent event  
Repurchase of common units (in shares) 31,165,589
Common membership units held by the Blackstone Funds (as a percent) 100.00%
Aggregate purchase price $ 14.0