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EARNINGS PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator for basic and diluted earnings per share -income available to common shareholders:
Net income	$ 96,787	$ 88,526	$ 75,063
Denominator for basic earnings per share - weighted average shares	61,529,460	61,206,093	61,062,657
Effect of dilutive securities -
Employee stock awards	581,329	729,335	670,282
Warrants	60,801	49,994	114,608
Denominator for diluted earnings per share - adjusted weighted average shares	62,171,590	61,985,422	61,847,547
Basic	$ 1.57	$ 1.45	$ 1.23
Diluted	$ 1.56	$ 1.43	$ 1.21

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Net Income (Loss) Available to Common Stockholders, Basic and Diluted [Abstract]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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