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Investments in unconsolidated entities - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2010
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| Investments in and Advances to Affiliates [Line Items] | |||
| Other than temporarily impaired and written off investment | $ 3,254,000 | $ 0 | $ 0 |
| Distribution received | 463,000 | 0 | 50,000 |
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Nephromics, LLC
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| Investments in and Advances to Affiliates [Line Items] | |||
| Percentage of Investment in equity interest | 16.80% | ||
| Other than temporarily impaired and written off investment | 2,400,000 | ||
| Distribution received | 421,000 | ||
| Net investment under equity method | 505,000.0 | 3,700,000 | |
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Hemerus Medical, LLC
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| Investments in and Advances to Affiliates [Line Items] | |||
| Percentage of Investment in equity interest | 6.90% | ||
| Net investment under equity method | 551,000 | 773,000 | |
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ACTGen, Inc.
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| Investments in and Advances to Affiliates [Line Items] | |||
| Other than temporarily impaired and written off investment | 854,000 | ||
| Ownership percentage on a cost basis | 13.60% | ||
| Net investment on a cost basis | $ 925,000 | ||