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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income from continuing operations for basic and diluted earnings per share	$ 23,894	$ 11,069
Net income from discontinued operations for basic and diluted earnings per share		5,098
Net income	$ 23,894	$ 16,167
Weighted average shares outstanding - basic	33,569	33,375
Dilutive effect of stock options and restricted stock	16	103
Weighted average shares outstanding - diluted	33,585	33,478
Earnings per share from continuing operations
Basic	$ 0.71	$ 0.33
Diluted	0.71	0.33
Earnings per share from discontinued operations
Basic		0.15
Diluted		0.15
Earnings per share net income
Basic	0.71	0.48
Diluted	$ 0.71	$ 0.48

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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X

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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- Definition

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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