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STOCK INCENTIVE PLANS - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available under incentive compensation plans (in shares) | shares	1,625,682
Unrecognized compensation expense	$ 20.0
Intrinsic value of outstanding and exercisable stock options	1.5
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	19.9
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 1.3
Service-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of units issued, years	3 years
Unrecognized compensation expense	$ 13.0

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Section 50
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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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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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