STOCK BASED COMPENSATION - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($) shares
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to non-vested option awards	$ 44.0
Weighted average period of recognition for unrecognized compensation expenses	3 years 11 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to RSUs	$ 4.2
Weighted average period of recognition for unrecognized compensation expenses	2 years 5 months 9 days
Ratio of share reserve related to RSUs granted \| shares	2
Restricted Stock Units (RSUs) [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Restricted Stock Units (RSUs) [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years

Number Of Shares Granted Against Share Limits

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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

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+ References

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- Definition

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+ References

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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

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-Publisher FASB

-Name Accounting Standards Codification

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