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Long-Term Compensation - Non-Vested Share Options (Detail) (Restricted Stock [Member], USD $)	9 Months Ended
	Sep. 30, 2012
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Share, Beginning balance	1,192,982
Granted	5,000
Vested	(507,465)
Forfeited	(2,865)
Number of Share, Ending balance	687,652
Weighted Average Grant-Date Fair Value, Ending Balance	$ 34.03

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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