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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
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Mar. 31, 2019 | Mar. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | $ 27,437 | $ 18,426
Interest Income Recognized | 669 | 667
Small Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 8,971 | 5,521
Interest Income Recognized | 247 | 251
Large Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 17,495 | 11,142
Interest Income Recognized | 414 | 371
Automobile Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 851 | 1,669
Interest Income Recognized | 8 | 41
Retail Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | $ 120 | 94
Interest Income Recognized |  | $ 4

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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