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Debt - Additional Information (Detail) (Unsecured Debt, USD $)
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12 Months Ended |
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Jun. 30, 2012
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| Debt Instrument [Line Items] | |
| Unsecured line of credit | $ 750,000 |
| Expiration date of line of credit facility | Oct. 31, 2012 |
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Line of Credit | One-month London interbank offered rate
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| Debt Instrument [Line Items] | |
| Interest rate charged on line of credit | 1.75% |