Disclosure about Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Repossessed assets	$ 822	$ 711
Liabilities
Senior revolving credit facility	302,279	292,379
Carrying Amount [Member] \| Level 1 Inputs [Member]
Assets
Cash	2,931	3,298
Restricted cash	1,900	1,338
Carrying Amount [Member] \| Level 2 Inputs [Member]
Assets
Interest rate caps	0	1
Carrying Amount [Member] \| Level 3 Inputs [Member]
Assets
Net finance receivables	434,823	413,943
Repossessed assets	822	711
Liabilities
Senior revolving credit facility	302,279	292,379
Estimated Fair Value [Member] \| Level 1 Inputs [Member]
Assets
Cash	2,931	3,298
Restricted cash	1,900	1,338
Estimated Fair Value [Member] \| Level 2 Inputs [Member]
Assets
Interest rate caps	0	1
Estimated Fair Value [Member] \| Level 3 Inputs [Member]
Assets
Net finance receivables	434,823	413,943
Repossessed assets	822	711
Liabilities
Senior revolving credit facility	$ 302,279	$ 292,379

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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