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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017
Stock Option |
Significant Accounting Policies [Line Items] |
Stock award, vesting period | 5 years
Full Value Awards |
Significant Accounting Policies [Line Items] |
Stock award, vesting period | 5 years
Software |
Significant Accounting Policies [Line Items] |
Intangible assets, estimated lives | 3 years
Minimum |
Significant Accounting Policies [Line Items] |
Intangible assets, estimated lives | 5 years
Minimum | Full Value Awards |
Significant Accounting Policies [Line Items] |
Restricted shares and restricted units grants, discount for post-vesting holding restrictions | 15.00%
Maximum |
Significant Accounting Policies [Line Items] |
Intangible assets, estimated lives | 8 years
Maximum | Full Value Awards |
Significant Accounting Policies [Line Items] |
Restricted shares and restricted units grants, discount for post-vesting holding restrictions | 21.00%

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- Definition Significant Accounting Policies [Line Items] + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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