EARNINGS PER SHARE (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share Reconciliation [Abstract]
Basic	43,892	44,182	44,389
Dilutive effect of stock options and deferred stock compensation	424	579	656
Diluted	44,316	44,761	45,045
Earnings from continuing operations	$ 6.28	$ 4.86	$ 4.27
Earnings from continuing operations	$ 6.22	$ 4.80	$ 4.20
Earnings from continuing operations	$ 275,749	$ 214,891	$ 189,382

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

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+ Details

- Definition

The amount of net income (loss) derived from continuing operations during 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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+ Details