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Related Party Transactions - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 3 Months Ended | ||||
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Apr. 30, 2012
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Jun. 30, 2009
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Sep. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2011
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Jun. 30, 2010
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Mar. 31, 2012
Series D convertible preferred stock
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| Related Party Transaction [Line Items] | |||||||
| Loan in exchange for a non-interest bearing promissory note | $ 6,000,000 | ||||||
| Common stock repurchased and subsequently cancelled | 23,510,264 | ||||||
| Stock repurchased and retired during period shares from founder family and chief financial officer | 18,436,000 | ||||||
| Offsetting liability withholding taxes plus potential interest and penalties | 5,300,000 | ||||||
| Prepaid expenses and other current assets representing withholding taxes | 5,300,000 | 5,300,000 | 5,300,000 | 5,300,000 | |||
| Tax paid | $ 5,300,000 |