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Stock-Based Compensation (Detail) - (Table 6) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested at January 1	2,889,000	671,000
Non-vested at January 1 (in Dollars per share)	$ 34.74	$ 25.44
Granted	250,000	1,050,000
Granted (in Dollars per share)	$ 42.85	$ 41.12
Vested	(141,500)	(103,000)
Vested (in Dollars per share)	$ 35.91	$ 12.08
Forfeited	(16,000)	0
Forfeitures (in dollars per share)	$ 30.81	$ 0
Non-vested at March 31	2,981,500	1,618,000
Non-vested at March 31 (in Dollars per share)	$ 36.74	$ 36.04

X

- Definition

The number of grants made 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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