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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance at beginning of period | $ 47,750 | $ 41,000 | $ 48,910 | $ 41,250 |
Provision | 20,203 | 18,589 | 39,718 | 37,723 |
Credit losses | (20,666) | (19,003) | (42,686) | (39,997) |
Recoveries | 1,163 | 1,414 | 2,508 | 3,024 |
Balance at end of period | 48,450 | 42,000 | 48,450 | 42,000 |
Finance receivables | $ 847,238 | $ 726,767 | $ 847,238 | $ 726,767 | $ 817,463
Allowance as Percentage of Finance Receivables | 5.70% | 5.80% | 5.70% | 5.80% |
Small Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance at beginning of period | $ 23,366 | $ 20,575 | $ 24,749 | $ 21,770 |
Provision | 12,720 | 11,082 | 24,003 | 22,245 |
Credit losses | (12,782) | (11,542) | (26,156) | (24,744) |
Recoveries | 665 | 795 | 1,373 | 1,639 |
Balance at end of period | 23,969 | 20,910 | 23,969 | 20,910 |
Finance receivables | $ 384,690 | $ 348,742 | $ 384,690 | $ 348,742 | 375,772
Allowance as Percentage of Finance Receivables | 6.20% | 6.00% | 6.20% | 6.00% |
Large Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance at beginning of period | $ 18,589 | $ 12,675 | $ 17,548 | $ 11,460 |
Provision | 6,784 | 6,124 | 13,663 | 11,727 |
Credit losses | (6,002) | (5,023) | (12,198) | (9,652) |
Recoveries | 327 | 224 | 685 | 465 |
Balance at end of period | 19,698 | 14,000 | 19,698 | 14,000 |
Finance receivables | $ 392,101 | $ 267,921 | $ 392,101 | $ 267,921 | 347,218
Allowance as Percentage of Finance Receivables | 5.00% | 5.20% | 5.00% | 5.20% |
Automobile Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance at beginning of period | $ 3,316 | $ 5,775 | $ 4,025 | $ 5,910 |
Provision | 64 | 825 | 585 | 2,563 |
Credit losses | (873) | (1,724) | (2,340) | (4,056) |
Recoveries | 135 | 334 | 372 | 793 |
Balance at end of period | 2,642 | 5,210 | 2,642 | 5,210 |
Finance receivables | $ 39,414 | $ 79,861 | $ 39,414 | $ 79,861 | 61,423
Allowance as Percentage of Finance Receivables | 6.70% | 6.50% | 6.70% | 6.50% |
Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance at beginning of period | $ 2,479 | $ 1,975 | $ 2,588 | $ 2,110 |
Provision | 635 | 558 | 1,467 | 1,188 |
Credit losses | (1,009) | (714) | (1,992) | (1,545) |
Recoveries | 36 | 61 | 78 | 127 |
Balance at end of period | 2,141 | 1,880 | 2,141 | 1,880 |
Finance receivables | $ 31,033 | $ 30,243 | $ 31,033 | $ 30,243 | $ 33,050
Allowance as Percentage of Finance Receivables | 6.90% | 6.20% | 6.90% | 6.20% |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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