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Goodwill and Identifiable Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Sep. 30, 2012
item
Sep. 30, 2011
Dec. 31, 2011
Nov. 30, 2011
EAS
Changes in the carrying amount of goodwill            
Balance at the beginning of period     $ 107,093 $ 147,818 $ 147,818  
Additions     7,495   16,629 15,700
Impairment adjustment 2,200 55,134   55,134 (57,354)  
Balance at the end of period $ 107,093   $ 114,588   $ 107,093  
Number of reporting units serving the Virginia, Maryland and North Carolina markets, which could no longer support the related goodwill balance     4