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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Net income attributable to common shareholders	$ 4,914	$ 4,849	$ 8,635	$ 9,327
Denominator:
Denominator for basic earnings per share - weighted-average shares	12,089	11,781	12,022	11,754
Effect of dilutive securities - Stock options	21	122	22	118
Denominator for diluted earnings per share - adjusted weighted-average shares	12,110	11,903	12,044	11,872
Earnings per share attributable to common shareholders:
Basic	$ 0.41	$ 0.41	$ 0.72	$ 0.79
Diluted	$ 0.41	$ 0.41	$ 0.72	$ 0.79

X

- Definition

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 share based payment arrangements using the treasury stock method.

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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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