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Notes Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable $ 4,770 $ 5,493
Allowance for doubtful notes      
Total 4,770 5,493
Less current portion 3,534 3,806
Non-current notes receivable $ 1,236 $ 1,687