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Summary of Weighted Average Grant-Date Fair Value of Common Stock Awarded and Cash Used to Settle Company's Obligation Under Deferred Compensation (Detail) (Common Stock, USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	13	10
Weighted average grant-date fair value	$ 15.28	$ 19.19
Fair value of vested	$ 178	$ 141
Cash used to settle the obligation	$ 263

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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