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EMPLOYEE STOCK COMPENSATION - Share Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 1,788	$ 4,798	$ 3,875	$ 7,691
Related tax benefits	524	1,992	1,136	3,195
Unrecognized Expense	12,066		$ 12,066
Weighted-Average Remaining Expected Recognition Period			2 years 8 months 9 days
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	80	420	$ 113	667
Unrecognized Expense	201		$ 201
Weighted-Average Remaining Expected Recognition Period			1 year 10 months 2 days
Restricted stock awards and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	1,708	4,378	$ 3,762	6,982
Unrecognized Expense	11,865		$ 11,865
Weighted-Average Remaining Expected Recognition Period			2 years 8 months 16 days
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 0	$ 0	$ 0	$ 42

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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