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Commitments and Contingencies - Narrative (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 14, 2014 USD ($) | May. 19, 2008 subsidiary | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) class_action | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | May. 11, 2011 class_action | Dec. 17, 2010 class_action
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of class actions | class_action |  |  |  | 4 |  |  | 2 | 2
Rent expense |  |  |  | $ 19,400,000 | $ 23,000,000 | $ 12,000,000 |  |
Purchase price of receivable portfolios |  |  |  | 1,800,000,000 |  |  |  |
Purchase price |  |  |  | 297,200,000 |  |  |  |
Purchase commitments in past one year |  |  |  | 0 |  |  |  |
Estimated fair value, liability |  |  |  | 0 |  |  |  |
Settlement fund |  |  |  | 2,000,000 |  |  |  |
Debt forgiveness allocation |  |  |  | $ 13,000,000 |  |  |  |
Brent v Midland Credit Management [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of defendant subsidiaries | subsidiary |  | 2 |  |  |  |  |  |
Class action, damages paid | $ 5,200,000 |  |  |  |  |  |  |
Class action, damages awarded, maximum | $ 5,700,000 |  |  |  |  |  |  |
Consent Order, Consumer Finance Protection Bureau [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
After-tax expense related to settlement |  |  | $ 43,000,000 |  |  |  |  |

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