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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Increase (decrease) in net income		$ 10,885	$ 5,309	$ 6,135	$ 7,634	$ 6,467	$ 6,476	$ 5,912	$ 5,176	$ 29,963	$ 24,031	$ 23,365
Increase (decrease) in diluted earnings per share		$ 0.92	$ 0.45	$ 0.52	$ 0.65	$ 0.55	$ 0.56	$ 0.49	$ 0.40	$ 2.54	$ 1.99	$ 1.79
Increase (decrease) in provision for credit losses		$ 19,464	$ 20,152	$ 18,589	$ 19,134	$ 19,427	$ 16,410	$ 13,386	$ 13,791	$ 77,339	$ 63,014	$ 47,348
Increase in loss allowance due to change in allowance assumption										100		500
Decrease in net income from a change in allowance assumption										$ (100)		$ (300)
Decrease in diluted earnings per share from a change in allowance assumption										$ 0.01		$ (0.02)
Allowance for credit losses as percentage of loans		6.00%				5.70%				6.00%	5.70%	6.00%
Impaired finance receivables as a percentage of total finance receivables										2.10%	1.60%
Previous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss emergence period of large loan finance receivable										12 months		10 months
Loss emergence period of small loan finance receivable										6 months
Loss emergence period of retail loan finance receivable										10 months
New [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss emergence period of large loan finance receivable										10 months		12 months
Loss emergence period of small loan finance receivable										7 months
Loss emergence period of retail loan finance receivable										11 months
Large Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses as percentage of loans		5.10%				4.90%				5.10%	4.90%	3.80%	4.30%
Hurricanes [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Increase (decrease) in net income			$ (1,900)
Increase (decrease) in diluted earnings per share			$ (0.16)
Increase (decrease) in provision for credit losses	$ 3,000
Bulk Sale of Charged Off Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recoveries	$ 1,000		$ 1,000									$ 2,000
Change in Accounting Method Accounted for as Change in Estimate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - factors influencing management's judgment										Prior to September 30, 2016, the general component reflected estimated credit losses for groups of finance receivables on a collective basis and was primarily based on historical loss rates (adjusted for qualitative factors). Effective September 30, 2016, the general component is primarily based on delinquency roll rates. Delinquency roll rate modeling is forward-looking and common practice in the consumer finance industry.
Increase (decrease) in provision for credit losses											$ (500)
Increase (decrease) in net income											$ 300
Increase (decrease) in diluted earnings per share											$ 0.03

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Percentage of total finance receivable held by the company with customers that are involved in bankruptcy proceedings.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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