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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) customer in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) office | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) claim | Sep. 30, 2018 USD ($) office | Dec. 31, 2017 USD ($) claim plaintiff customer | Sep. 30, 2018 USD ($) office
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Accruals related to guarantees and indemnities | $ |  | $ 0 |  |  | $ 0 | $ 0 | $ 0 | $ 0
Indian Tribes and Nations |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Pending claims | claim |  |  |  |  | 2 |  | 2 |
Maximum |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term (or less) |  |  |  |  |  | 1 year |  |
United States |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Pending claims | claim |  |  |  |  | 1,000 |  | 1,000 |
Number of plaintiffs | plaintiff |  |  |  |  |  |  | 2,500 |
Pending individual arbitration claims | claim |  |  |  |  | 50 |  | 50 |
Pending putative class action claims | claim |  |  |  |  | 19 |  | 19 |
Canada |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Pending claims | claim |  |  |  |  | 7 |  | 7 |
Pending national class actions | claim |  |  |  |  | 5 |  | 5 |
Georgia |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Pending claims | claim |  |  |  |  | 4 |  | 4 |
Number of claims combined into a single claim | claim |  |  |  |  |  |  | 3 |
Cybersecurity Incident |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of customers impacted | customer |  |  |  |  |  |  | 145,500 |
Cybersecurity incident remediation, legal, and other professional costs | $ | $ 87,500,000 |  | $ 0 | $ 4,100,000 | $ 76,500,000 |  |  |
Insurance recoveries | $ |  | $ 0 |  |  |  | $ 45,000,000 |  | $ 95,000,000
Number of state attorneys general offices company is in cooperation with | office |  | 48 |  |  |  | 48 |  | 48
Cybersecurity Incident | United States and Canada |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of customers, credit card information accessed | customer |  |  |  |  |  |  | 209 |
Cybersecurity Incident | United States |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of customers, personal information accessed | customer |  |  |  |  |  |  | 182 |
Number of customers, name and partial driver's license information stolen | customer |  |  |  |  |  |  | 2,400 |
Cybersecurity Incident | Canada |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of customers, personal information accessed | customer |  |  |  |  |  |  | 19 |
Cybersecurity Incident | United Kingdom |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of customers, personal information accessed | customer |  |  |  |  |  |  | 860 |
Free Credit File Monitoring And Identity Theft Protection Offering |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Cybersecurity incident remediation, legal, and other professional costs | $ |  |  |  |  |  |  | $ 50,700,000 |
Free Credit File Monitoring And Identity Theft Protection Offering | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Cybersecurity incident remediation, legal, and other professional costs | $ |  | $ 7,800,000 |  |  |  | $ 11,900,000 |  |
Investigation, Remediation, Legal, And Other Professional Services |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Cybersecurity incident remediation, legal, and other professional costs | $ |  |  |  |  |  |  | $ 113,300,000 |
Insurance coverage | $ |  |  |  |  |  | 125,000,000 |  |
Insurance coverage deductible | $ |  |  |  |  |  | $ 7,500,000.0 |  |
Multi-State Investigation |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of state attorneys general offices company is in cooperation with | office |  | 46 |  |  |  | 46 |  | 46

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