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Revenue, Payment Terms Upon Completion Of Performance Obligation

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Significant Accounting Policies [Line Items]

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 243,796	$ 447,858
Stock Awards
Significant Accounting Policies [Line Items]
Stock award vesting period (in years)	5 years
Restricted shares and restricted stock units \| Minimum
Significant Accounting Policies [Line Items]
Shares and restricted units grants, discount for post-vesting holding restrictions (percent)	12.00%
Restricted shares and restricted stock units \| Maximum
Significant Accounting Policies [Line Items]
Shares and restricted units grants, discount for post-vesting holding restrictions (percent)	22.00%
Software
Significant Accounting Policies [Line Items]
Estimated useful life (in years)	3 years
Held outside the United States
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 230,900	$ 405,100
Transportation services
Significant Accounting Policies [Line Items]
General payment terms upon completion of performance obligation	30 days
Value-added logistics services
Significant Accounting Policies [Line Items]
General payment terms upon completion of performance obligation	30 days
Sourcing Services \| Minimum
Significant Accounting Policies [Line Items]
General payment terms upon completion of performance obligation	20 days
Sourcing Services \| Maximum
Significant Accounting Policies [Line Items]
General payment terms upon completion of performance obligation	30 days
Logistics and Transportation
Significant Accounting Policies [Line Items]
General payment terms upon completion of performance obligation	30 days
Typical contract period, maximum (in years)	1 year