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Common Stock - Summary of Information Regarding Outstanding Restricted Shares (Detail) (USD $)	1 Months Ended	12 Months Ended
	Feb. 21, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted shares outstanding, Beginning balance		1,606,047	1,765,837	2,181,244
Restricted stock granted, shares	464,270	482,428	374,425	558,531
Restricted stock vested, shares		(406,844)	(496,642)	(921,454)
Restricted stock canceled, shares		(344,965)	(37,573)	(52,484)
Restricted shares outstanding, Ending balance		1,336,666	1,606,047	1,765,837
Weighted-average grant date fair value of restricted stock, Beginning balance		$ 44.21	$ 42.15	$ 40.51
Restricted stock granted, Weighted-average grant date fair value		$ 83.79	$ 79.53	$ 43.99
Restricted stock vested, Weighted-average grant date fair value		$ 83.34	$ 64.22	$ 43.28
Restricted stock canceled, Weighted-average grant date fair value		$ 30.39	$ 44.02	$ 35.11
Weighted-average grant date fair value of restricted stock, Ending balance		$ 67.56	$ 44.21	$ 42.15

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- 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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- Definition

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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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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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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