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Investment in Receivable Portfolios, Net - Summary of Accretable Yield and an Estimate of Zero Basis Future Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield and Estimate of Zero Basis Future Cash Flows Movement Schedule [Roll Forward] |  |  |
Beginning balance | $ 3,457,508 | $ 3,270,671 |
Revenue recognized, net | (1,094,609) | (946,615) | $ (1,072,436)
Net additions on existing portfolios | 520,517 | 728,748 |
Additions for current purchases, net | 1,019,856 | 861,698 |
Effect of foreign currency translation | 161,429 | (456,994) |
Ending balance | 4,064,701 | 3,457,508 | 3,270,671
Accretable Yield |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield and Estimate of Zero Basis Future Cash Flows Movement Schedule [Roll Forward] |  |  |
Beginning balance | 3,092,004 | 3,047,640 |
Revenue recognized, net | (943,533) | (801,736) |
Net additions on existing portfolios | 365,357 | 441,632 |
Additions for current purchases, net | 1,019,856 | 861,698 |
Effect of foreign currency translation | 161,385 | (457,230) |
Ending balance | 3,695,069 | 3,092,004 | 3,047,640
Estimate of Zero Basis Cash Flows |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield and Estimate of Zero Basis Future Cash Flows Movement Schedule [Roll Forward] |  |  |
Beginning balance | 365,504 | 223,031 |
Revenue recognized, net | (151,076) | (144,879) |
Net additions on existing portfolios | 155,160 | 287,116 |
Additions for current purchases, net | 0 | 0 |
Effect of foreign currency translation | 44 | 236 |
Ending balance | $ 369,632 | $ 365,504 | $ 223,031

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Additions For Current Purchases Accretable Yield + References No definition available. + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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