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Earnings Per Share (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Income from continuing operations									$ 27,721	$ 17,835	$ 19,567
Income from discontinued operations											491
Net income	$ 7,306	$ 6,686	$ 7,584	$ 6,145	$ 4,113	$ 6,065	$ 3,397	$ 4,260	$ 27,721	$ 17,835	$ 20,058
Denominator:
Weighted average shares of common stock outstanding									11,924	11,842	11,959
Effect of dilutive common stock equivalents									164	105	112
Weighted average shares of common stock outstanding									12,088	11,947	12,071
Basic earnings per share
Earnings per share from continuing operations									$ 2.32	$ 1.51	$ 1.64
Earnings per share from discontinued operations											0.04
Earnings per share	$ 0.61	$ 0.56	$ 0.64	$ 0.52	$ 0.35	$ 0.51	$ 0.29	$ 0.36	2.32	1.51	1.68
Diluted earnings per share
Earnings per share from continuing operations									2.29	1.49	1.62
Earnings per share from discontinued operations											0.04
Earnings per share	$ 0.60	$ 0.55	$ 0.63	$ 0.51	$ 0.34	$ 0.51	$ 0.29	$ 0.36	$ 2.29	$ 1.49	$ 1.66

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