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Loan Transactions and Related Notes Receivable - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Jul. 31, 2013
First Credit Agreement
Jan. 31, 2009
First Credit Agreement
Jan. 31, 2009
Second Credit Agreement
Jul. 31, 2013
Third Credit Agreement
Dec. 31, 2009
Third Credit Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan amount   $ 10,000 $ 10,000   $ 10,000
Original principal amount outstanding $ 4,000     $ 8,500  
Notes receivable, maturity Jan. 15, 2014     Aug. 30, 2015