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Other Information Pertaining to Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of stock options granted:	$ 2,438,000	$ 1,477,000
Total fair value of stock options vested:	1,870,000	1,015,000
Total intrinsic value of stock options exercised:	5,026,000	4,736,000
Total pre-tax share-based compensation expense charged against income:	1,423,000	1,402,000
Total unrecognized compensation expense related to non-vested options:	$ 4,473,000	$ 4,015,000

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Grant In Period Weighted Average Grant Date Fair Value.

+ References

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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