Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

Debt - Additional Information (Detail) (Unsecured Debt, USD $)
12 Months Ended
Jun. 30, 2011
Debt Instrument [Line Items]  
Unsecured line of credit $ 750,000
Expiration date of line of credit facility 2011-10-31
Line of Credit | one-month London interbank offered rate
Debt Instrument [Line Items]  
Interest rate charged on line of credit 1.75%