STOCK-BASED COMPENSATION (3) (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units \| shares	2,683,127
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 14.79
Total Compensation Cost	$ 39,700
Unrecognized compensation cost	$ 20,200
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units \| shares	310,316
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 29.22
Total Compensation Cost	$ 9,100
Unrecognized compensation cost	$ 4,600
RSUs \| January 1, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2017
Shares/Units \| shares	140,416
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 31.26
Total Compensation Cost	$ 4,400
Weighted Average Period of Expense Recognition	36 months
Unrecognized compensation cost	$ 1,500
Vesting Dates	12/31/2019
RSUs \| January 1, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2018
Shares/Units \| shares	169,900
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 27.54
Total Compensation Cost	$ 4,700
Weighted Average Period of Expense Recognition	36 months
Unrecognized compensation cost	$ 3,100
Vesting Dates	12/31/2020
LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units \| shares	1,447,366
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 10.28
Total Compensation Cost	$ 14,900
Unrecognized compensation cost	$ 7,500
Relative TSR PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/Units \| shares	925,445
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 17.01
Total Compensation Cost	$ 15,700
Unrecognized compensation cost	$ 8,100
2018 LTIP Units \| LTIPs \| March 17, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2016
Shares/Units \| shares	370,152
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 13.21
Total Compensation Cost	$ 4,900
Weighted Average Period of Expense Recognition	45 months
Unrecognized compensation cost	$ 1,300
Performance Period	1/1/2016-12/31/2018
Vesting Dates	Quarterly in 2019
2019 LTIP Units \| LTIPs \| January 1, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2017
Shares/Units \| shares	399,726
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 12.61
Total Compensation Cost	$ 5,000
Weighted Average Period of Expense Recognition	48 months
Unrecognized compensation cost	$ 2,500
Performance Period	1/1/2017-12/31/2019
Vesting Dates	Quarterly in 2020
2020 LTIP Units \| LTIPs \| January 1, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2018
Shares/Units \| shares	677,488
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 7.31
Total Compensation Cost	$ 5,000
Weighted Average Period of Expense Recognition	48 months
Unrecognized compensation cost	$ 3,700
Performance Period	1/1/2018 - 12/31/2020
Vesting Dates	Quarterly in 2021
2018 TSR \| Relative TSR PRSUs \| March 17, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2016
Shares/Units \| shares	305,563
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 16.44
Total Compensation Cost	$ 5,000
Weighted Average Period of Expense Recognition	45 months
Unrecognized compensation cost	$ 1,300
Performance Period	1/1/2016-12/31/2018
Vesting Dates	Quarterly in 2019
2019 TSR \| Relative TSR PRSUs \| January 1, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2017
Shares/Units \| shares	285,338
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 18.04
Total Compensation Cost	$ 5,100
Weighted Average Period of Expense Recognition	48 months
Unrecognized compensation cost	$ 2,600
Performance Period	1/1/2017-12/31/2019
Vesting Dates	Quarterly in 2020
2020 TSR \| Relative TSR PRSUs \| January 1, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Year	2018
Shares/Units \| shares	334,544
Grant Date Average Fair Value Per Unit/ Share \| $ / shares	$ 16.65
Total Compensation Cost	$ 5,600
Weighted Average Period of Expense Recognition	48 months
Unrecognized compensation cost	$ 4,200
Performance Period	1/1/2018 - 12/31/2020
Vesting Dates	Quarterly in 2021

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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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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.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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