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Summary of Weighted Average Grant-Date Fair Value of Common Stock Units and Share Awards Granted and Total Fair Value of Common Stock Units and Share Awards Vested (Detail) (Common Stock Units And Share Awards, USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Common Stock Units And Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	42	21
Weighted average grant-date fair value	$ 16.15	$ 21.83
Fair value of vested	$ 551	$ 320

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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