3. Fair Value of Delinquency Status of Finance Receivables (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deliquency Status
Total finance receivables measured at fair value	$ 21,701	$ 60,804
Current
Deliquency Status
Total finance receivables measured at fair value	19,795	57,557
31-60 days
Deliquency Status
Total finance receivables measured at fair value	1,218	2,206
61-90 days
Deliquency Status
Total finance receivables measured at fair value	436	710
91 + days
Deliquency Status
Total finance receivables measured at fair value	$ 252	$ 331