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EMPLOYEE STOCK COMPENSATION - Share Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 1,398	$ 2,221	$ 5,273	$ 9,912
Related tax benefits	410	927	1,546	4,122
Unrecognized Expense	11,026		$ 11,026
Weighted-Average Remaining Expected Recognition Period			2 years 4 months 13 days
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	32	36	$ 145	703
Unrecognized Expense	173		$ 173
Weighted-Average Remaining Expected Recognition Period			1 year 7 months 15 days
Restricted stock awards and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	1,366	2,185	$ 5,128	9,167
Unrecognized Expense	10,853		$ 10,853
Weighted-Average Remaining Expected Recognition Period			2 years 4 months 17 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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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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