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Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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	13,262,023	12,725,216	13,212,424	12,707,143
Effect of dilutive securities:
Stock options, SARs, RSAs, and shares held in escrow	1,181,771	1,014,620	1,090,015	1,034,194
Diluted shares used in the calculation of earnings per share	14,443,794	13,739,836	14,302,439	13,741,337

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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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