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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2012 Clients | Jun. 30, 2012 Clients | Dec. 31, 2012 Clients
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Number of clients accounted for 10% or more of net revenue | 0 |  | 0
Percentage of revenue accounted by major clients | 10.00% |  | 10.00%
Percentage of net accounts receivable from major clients |  | 10.00% | 10.00%
Number of clients accounted for 10% or more of net accounts receivable |  | 0 | 0
U.S municipal securities and certificates of deposits maturity period |  |  | 90 days

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- Definition Maximum percentage of net accounts receivable accounted by client. + References No definition available. + Details
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- Definition Maximum Percentage Of Revenue Represented By Any Customer + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Definition Money market instruments maturity period. + References No definition available. + Details
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- Definition Number Of Customers Accounted For More Than Ten Percent Of Accounts Receivable + References No definition available. + Details
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- Definition Number Of Customers Representing Greater Than Ten Percent Of Net Sales Or Accounts Receivable + References No definition available. + Details
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- Details
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Namespace Prefix: | us-gaap_
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