Summary of Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
Sep. 30, 2013 RiskRating Segment
Accounting Policies [Abstract]
Number of operating segments	1
Finance receivable charged-off	360 days past due or earlier
Number of scores	10
Risk rate description	The TimePayment scoring model generates one of ten acceptable risk ratings based upon the creditworthiness of each application or it rejects the application
Cash and Cash Equivalents, Maturity description	less than three months

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration