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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income from continuing operations for basic and diluted earnings per share	$ 25,764	$ 11,588	$ 53,987	$ 23,700
Net income from discontinued operations for basic and diluted earnings per share	88,846	3,746	98,842	11,510
Net income	$ 114,610	$ 15,334	$ 152,829	$ 35,210
Weighted average shares outstanding - basic	33,399	33,227	33,387	33,217
Dilutive effect of stock options and restricted stock	206	108	161	106
Weighted average shares outstanding - diluted	33,605	33,335	33,548	33,323
Earnings per share from continuing operations
Basic	$ 0.77	$ 0.35	$ 1.62	$ 0.71
Diluted	0.77	0.35	1.61	0.71
Earnings per share from discontinued operations
Basic	2.66	0.11	2.96	0.35
Diluted	2.64	0.11	2.95	0.35
Earnings per share net income
Basic	3.43	0.46	4.58	1.06
Diluted	$ 3.41	$ 0.46	$ 4.56	$ 1.06

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