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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Schedule of Average Recorded Investment in Impaired Finance Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Total average recorded investment | $ 9,531 | $ 6,132 | $ 8,483 | $ 6,147
Small Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total average recorded investment | 1,908 | 1,096 | 1,497 | 1,114
Large Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total average recorded investment | 4,861 | 1,340 | 3,992 | 1,291
Automobile Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total average recorded investment | 2,643 | 3,567 | 2,879 | 3,616
Retail Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total average recorded investment | $ 119 | $ 129 | $ 115 | $ 126

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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