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Summary of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,866	$ 1,076
Accrued processing and disbursement costs	1,722	1,055
Other accrued expenses	4,354	5,019
Accounts payable and accrued expenses	$ 7,942	$ 7,150

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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