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Component of Property and Equipment and their Estimated Useful Lives (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment $ 172,412 $ 170,462
Less accumulated depreciation 120,591 119,139
Property and equipment, net $ 51,821 $ 51,323