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Stock-Based Compensation (Detail) - (Table 6) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
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	671,000	563,000
Non-vested at January 1 (in Dollars per share)	$ 25.44	$ 17.20
Granted	1,140,000	323,000
Granted (in Dollars per share)	$ 41.13	$ 31.16
Vested	(169,000)	(179,000)
Vested (in Dollars per share)	$ 24.80	$ 14.93
Non-vested at June 30	1,642,000	707,000
Non-vested at June 30 (in Dollars per share)	$ 36.40	$ 24.15
Forfeited	0	0
Forfeitures (in dollars per share)	$ 0	$ 0

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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