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PROPERTY, EQUIPMENT AND SOFTWARE, NET - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | $ 22,351 | $ 0 | $ 0
Amortization of internally-developed software | 58,800 | 56,600 | 53,900
Amortization of right-of-use assets | 6,737 | $ 18,922 | $ 30,200
Portion of Restructuring and Related Charges |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 5,600 |  |
Restructuring and related charges |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 21,600 |  |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 8,419 |  |
Portion of Long-Lived Asset Impairment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | 9,600 |  |
Long-Lived Asset Impairment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-lived asset impairment | $ 22,400 |  |

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