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Summary of Weighted Average Grant-Date Fair Value Granted and Total Fair Value of Restricted Shares and Restricted Stock Units Vested (Detail) (Restricted Shares And Restricted Stock Units, USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Restricted Shares And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	420	339
Weighted average grant-date fair value	$ 15.21	$ 18.67
Fair value of vested	$ 3,845	$ 4,392

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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