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Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Shares used in the calculation of Basic earnings per share	13,287,463	12,817,910	13,237,629	12,744,471
Effect of dilutive securities:
Stock options, SARs, RSAs, and shares held in escrow	1,171,691	947,623	1,120,162	985,364
Diluted shares used in the calculation of earnings per share	14,459,154	13,765,533	14,357,791	13,729,835

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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