STOCK-BASED COMPENSATION - Schedule of Standard and Market-based Stock Options Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Standard stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning outstanding balance (in shares)	3,277,991	3,421,121	3,596,533
Granted (in shares)	207,500	489,568	815,794
Exercised (in shares)	(1,452,306)	(70,608)	(395,515)
Forfeited (in shares)	(78,390)	(361,687)	(344,541)
Expired (in shares)	(92,372)	(200,403)	(251,150)
Ending outstanding balance (in shares)	1,862,423	3,277,991	3,421,121
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in dollars per share)	$ 7.99	$ 8.44	$ 8.45
Weighted average exercise price, granted (in dollars per share)	12.50	8.48	7.85
Weighted average exercise price, exercised (in dollars per share)	6.52	7.34	6.48
Weighted average exercise price, forfeited (in dollars per share)	8.31	9.11	9.05
Weighted average exercise price, expired (in dollars per share)	11.93	15.04	8.87
Weighted average exercise price, ending balance (in dollars per share)	9.44	7.99	8.44
Weighted average fair value of options granted (in dollars per share)	$ 5.82	$ 3.82	$ 3.67
Aggregate intrinsic value of options exercised	$ 8,222	$ 151	$ 918
Market condition based stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning outstanding balance (in shares)	272,081	225,000	200,000
Granted (in shares)	0	120,830	75,000
Exercised (in shares)	0	0	0
Forfeited (in shares)	0	(73,749)	(50,000)
Expired (in shares)	0	0	0
Ending outstanding balance (in shares)	272,081	272,081	225,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in dollars per share)	$ 8.44	$ 8.39	$ 9.05
Weighted average exercise price, granted (in dollars per share)		8.65	9.00
Weighted average exercise price, exercised (in dollars per share)
Weighted average exercise price, forfeited (in dollars per share)		8.64	11.94
Weighted average exercise price, expired (in dollars per share)
Weighted average exercise price, ending balance (in dollars per share)	8.44	8.44	8.39
Weighted average fair value of options granted (in dollars per share)		$ 3.12	$ 3.68
Aggregate intrinsic value of options exercised

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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