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Earnings per share - Schedule of Reconciliation of Weighted Average Shares Used in Calculation of Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Weighted average common shares-basic	19,140,520	18,827,452	19,285,004	18,751,573
Effect of dilutive securities:
Unexercised stock options net of treasury share repurchase	129,524	388,532	198,711	417,367
Weighted average common shares-diluted	19,270,044	19,215,984	19,483,715	19,168,940

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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 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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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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