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Share-Based Compensation - Additional Information (Detail) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized	4,200	8,729
Percentage increase in the number of shares authorized for issuance under the Incentive Plan	2.50%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized		1,050

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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