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Significant Accounting Policies and Consolidated Financial Statement Components Rental Merchandise (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Leased Merchandise [Abstract] |  |  |  |
Depreciation of rental merchandise | $ 1,335 | $ 9,370 | $ 4,714 | $ 21,623

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- Definition Depreciation of leased merchandise + References No definition available. + Details
Name: | atlc_Depreciationofleasedmerchandise
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Leased Merchandise [Abstract] + References No definition available. + Details
Name: | atlc_LeasedMerchandiseAbstract
Namespace Prefix: | atlc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration