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Investment in Receivable Portfolios, Net - Summary of Changes in Balance of Investment in Receivable Portfolios (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | $ 2,382,809 |  |  |  | $ 2,440,669 | $ 2,382,809 | $ 2,440,669 | $ 2,143,560
Purchases of receivable portfolios |  |  |  |  |  |  |  |  | 1,058,235 | 906,719 | 1,023,722
Transfer of portfolios |  |  |  |  |  |  |  |  |  | 0 |
Disposals or transfers to held for sale |  |  |  |  |  |  |  |  | (13,188) |  |
Gross collections | $ (437,603) | $ (442,996) | $ (446,182) | (440,863) | $ (396,738) | $ (406,961) | $ (434,100) | (447,805) | (1,767,644) | (1,685,604) | (1,700,725)
Put-backs and Recalls |  |  |  |  |  |  |  |  | (2,871) | (28,613) | (13,297)
Foreign currency adjustments |  |  |  |  |  |  |  |  | 138,663 | 196,977 | (85,027)
Revenue recognized |  |  |  |  |  |  |  |  | 1,053,373 | 1,030,792 | 1,065,673
Portfolio allowance reversals, net |  |  |  |  |  |  |  |  | 41,236 | (84,177) | 6,763
Balance, end of period | 2,890,613 |  |  |  | 2,382,809 |  |  |  | $ 2,890,613 | $ 2,382,809 | $ 2,440,669
Revenue as a percentage of collections |  |  |  |  |  |  |  |  | 59.60% | 61.20% | 62.70%
Accrual Basis Portfolios |  |  |  |  |  |  |  |  |  |  |
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 2,368,366 |  |  |  | 2,436,054 | $ 2,368,366 | $ 2,436,054 | $ 2,131,084
Purchases of receivable portfolios |  |  |  |  |  |  |  |  | 1,057,066 | 906,719 | 1,023,722
Transfer of portfolios |  |  |  |  |  |  |  |  |  | 13,076 |
Disposals or transfers to held for sale |  |  |  |  |  |  |  |  | (12,695) |  |
Gross collections |  |  |  |  |  |  |  |  | (1,613,351) | (1,538,663) | (1,587,525)
Put-backs and Recalls |  |  |  |  |  |  |  |  | (2,577) | (27,561) | (13,009)
Foreign currency adjustments |  |  |  |  |  |  |  |  | 138,828 | 196,842 | (82,443)
Revenue recognized |  |  |  |  |  |  |  |  | 909,239 | 892,732 | 969,227
Portfolio allowance reversals, net |  |  |  |  |  |  |  |  | 34,294 | (90,997) | (5,002)
Balance, end of period | 2,879,170 |  |  |  | 2,368,366 |  |  |  | $ 2,879,170 | $ 2,368,366 | $ 2,436,054
Revenue as a percentage of collections |  |  |  |  |  |  |  |  | 56.40% | 58.00% | 61.10%
Cost Recovery Portfolios |  |  |  |  |  |  |  |  |  |  |
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | 14,443 |  |  |  | 4,615 | $ 14,443 | $ 4,615 | $ 12,476
Purchases of receivable portfolios |  |  |  |  |  |  |  |  | 1,169 | 0 | 0
Transfer of portfolios |  |  |  |  |  |  |  |  |  | (13,076) |
Disposals or transfers to held for sale |  |  |  |  |  |  |  |  | (493) |  |
Gross collections |  |  |  |  |  |  |  |  | (3,511) | (2,102) | (5,237)
Put-backs and Recalls |  |  |  |  |  |  |  |  | 0 | (1,019) | (20)
Foreign currency adjustments |  |  |  |  |  |  |  |  | (165) | 127 | (2,604)
Revenue recognized |  |  |  |  |  |  |  |  | 0 | 0 | 0
Portfolio allowance reversals, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Balance, end of period | 11,443 |  |  |  | 14,443 |  |  |  | $ 11,443 | $ 14,443 | $ 4,615
Revenue as a percentage of collections |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Zero Basis Portfolios |  |  |  |  |  |  |  |  |  |  |
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0 | $ 0
Purchases of receivable portfolios |  |  |  |  |  |  |  |  | 0 | 0 | 0
Transfer of portfolios |  |  |  |  |  |  |  |  |  | 0 |
Disposals or transfers to held for sale |  |  |  |  |  |  |  |  | 0 |  |
Gross collections |  |  |  |  |  |  |  |  | (150,782) | (144,839) | (107,963)
Put-backs and Recalls |  |  |  |  |  |  |  |  | (294) | (33) | (268)
Foreign currency adjustments |  |  |  |  |  |  |  |  | 0 | 8 | 20
Revenue recognized |  |  |  |  |  |  |  |  | 144,134 | 138,060 | 96,446
Portfolio allowance reversals, net |  |  |  |  |  |  |  |  | 6,942 | 6,820 | 11,765
Balance, end of period | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0
Revenue as a percentage of collections |  |  |  |  |  |  |  |  | 95.60% | 95.30% | 89.30%

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