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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 378,615 | $ 333,890 | $ 247,666 | $ 168,229
Stock award, vesting period | 5 years |  |  |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, estimated lives | 5 years |  |  |
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, estimated lives | 8 years |  |  |
Full Value Awards |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stock award, vesting period | 5 years |  |  |
Full Value Awards | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Shares and restricted units grants, discount for post-vesting holding restrictions (percent) | 15.00% |  |  |
Full Value Awards | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Shares and restricted units grants, discount for post-vesting holding restrictions (percent) | 21.00% |  |  |
Software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets, estimated lives | 3 years |  |  |
Held outside the United States |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 320,000 | $ 275,300 |  |
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 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
General payment terms upon completion of performance obligation | 30 days |  |  |

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- Definition Revenue, Payment Terms Upon Completion Of Performance Obligation + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(v) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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