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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary Of Impact Of Allowance For Credit Losses During The period (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Receivables [Abstract] |  |  |  |
Beginning balance | $ 139,400 | $ 142,000 | $ 150,000 | $ 62,200
Impact of CECL adoption |  |  |  | 60,100
COVID-19 reserve build (release) | (2,000) | (1,500) | (14,900) | 31,900
General reserve build (release) due to portfolio change | 12,700 | 3,500 | 15,000 | (10,200)
Ending balance | $ 150,100 | $ 144,000 | $ 150,100 | $ 144,000
Allowance as Percentage of Finance Receivables | 11.40% | 13.60% | 11.40% | 13.60%

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- Definition Amount of build (release) in the allowance for credit losses related to the macroeconomic reserve related to COVID-19. + References No definition available. + Details
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- Definition The impact of CECL adoption on the beginning Allowance for Credit Losses. + References No definition available. + 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://www.xbrl.org/2009/role/commonPracticeRef -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=122038336&loc=d3e74567-122707 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=123577603&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=121614798&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=123577603&loc=SL6953423-111524 + Details
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