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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	12 Months Ended
	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.

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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

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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

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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.

+ 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

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