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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
	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.

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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

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