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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | $ 3,332,242 | $ 3,041,631 | $ 3,059,713 | $ 2,910,986 | $ 2,854,453 | $ 2,399,936 | $ 3,059,713 | $ 2,399,936
Revenue recognized, net | (265,523) | (270,301) | (264,110) | (251,785) | (248,231) | (237,568) | (799,934) | (737,584)
Net additions on existing portfolios | 114,370 | 165,880 | 160,336 | 215,806 | 86,717 | 100,880 |  |
Additions for current purchases, net | 149,255 | 395,032 | 85,692 | 179,604 | 218,047 | 591,205 |  |
Balance at end of period | 3,330,344 | 3,332,242 | 3,041,631 | 3,054,611 | 2,910,986 | 2,854,453 | 3,330,344 | 3,054,611
Accretable Yield [Member] |  |  |  |  |  |  |  |
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | 3,194,104 | 2,951,203 | 2,993,321 | 2,901,050 | 2,843,944 | 2,391,471 | 2,993,321 | 2,391,471
Revenue recognized, net | (233,680) | (243,425) | (248,539) | (244,561) | (241,523) | (231,057) |  |
Net additions on existing portfolios | (3,548) | 91,294 | 120,729 | 161,622 | 80,582 | 92,325 |  |
Additions for current purchases, net | 149,255 | 395,032 | 85,692 | 179,604 | 218,047 | 591,205 |  |
Balance at end of period | 3,106,131 | 3,194,104 | 2,951,203 | 2,997,715 | 2,901,050 | 2,843,944 | 3,106,131 | 2,997,715
Estimate of Zero Basis Cash Flows [Member] |  |  |  |  |  |  |  |
Investment in Receivables Portfolio [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | 138,138 | 90,428 | 66,392 | 9,936 | 10,509 | 8,465 | 66,392 | 8,465
Revenue recognized, net | (31,843) | (26,876) | (15,571) | (7,224) | (6,708) | (6,511) | (74,300) | (20,400)
Net additions on existing portfolios | 117,918 | 74,586 | 39,607 | 54,184 | 6,135 | 8,555 |  |
Additions for current purchases, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Balance at end of period | $ 224,213 | $ 138,138 | $ 90,428 | $ 56,896 | $ 9,936 | $ 10,509 | $ 224,213 | $ 56,896

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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=6379141&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=27045933&loc=d3e13503-111538 + Details
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