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Certain Relationships and Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Coventry markets | Radiology and oncology services agreement
   
Certain Relationships and Related Party Transactions    
Revenues derived due to transactions with related parties $ 135.8 $ 124.1
Director | Subsidiary of AmeriGroup | Radiology benefits management agreement
   
Certain Relationships and Related Party Transactions    
Revenues derived due to transactions with related parties $ 1.8 $ 1.7