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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (Customer Lists And Other Intangibles, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Customer Lists And Other Intangibles
   
Intangible Assets [Line Items]    
Gross Carrying Amount $ 286,783 $ 286,783
Accum. Amortization 214,349 212,071
Net $ 72,434 $ 74,712