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Funds Held for Clients and Client Funds Obligation - Additional Information (Detail)
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6 Months Ended |
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Jun. 30, 2014
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| Accounts Payable And Accrued Expenses [Line Items] | |
| Maximum holding period for funds collected from clients | 120 days |
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Minimum [Member]
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| Accounts Payable And Accrued Expenses [Line Items] | |
| Disbursement period of funds collected from clients | 1 day |
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Maximum [Member]
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| Accounts Payable And Accrued Expenses [Line Items] | |
| Disbursement period of funds collected from clients | 30 days |