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Commitments and Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 15 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Property
Jun. 30, 2012
Jun. 30, 2013
Commitments and Contingencies [Line Items]        
Deposit related to proprietary loan program $ 1,000,000 $ 1,000,000   $ 1,000,000
Number of campus properties leased from a related party   2    
Lease expiration date   Dec. 31, 2022    
Future minimum lease payments for 2014 27,618,000 27,618,000   27,618,000
Future minimum lease payments for 2015 26,906,000 26,906,000   26,906,000
Future minimum lease payments for 2016 25,350,000 25,350,000   25,350,000
Future minimum lease payments for 2017 22,253,000 22,253,000   22,253,000
Future minimum lease payments, Thereafter 94,409,000 94,409,000   94,409,000
Expenses Incurred with bank and other services 400,000 1,500,000 1,100,000 0
Total amount of loans committed to provide 70,900,000 70,900,000   70,900,000
Total amount of loans committed to provide 70,900,000 70,900,000   70,900,000
ARIZONA | Amended Lease Agreements
       
Commitments and Contingencies [Line Items]        
Future minimum lease payments for 2013 500,000 500,000   500,000
Future minimum lease payments for 2014 700,000 700,000   700,000
Future minimum lease payments for 2015 700,000 700,000   700,000
Future minimum lease payments for 2016 800,000 800,000   800,000
Future minimum lease payments for 2017 800,000 800,000   800,000
Future minimum lease payments, Thereafter $ 4,500,000 $ 4,500,000   $ 4,500,000