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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 | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Total average recorded investment | $ 14,320 | $ 9,079
Small Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Total average recorded investment | 3,946 | 1,686
Large Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Total average recorded investment | 8,205 | 4,478
Automobile Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Total average recorded investment | 2,062 | 2,801
Retail Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Total average recorded investment | $ 107 | $ 114

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=84173941&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=84173941&loc=d3e5258-111524 + Details
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