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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