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Stock-Based Compensation - Summarizes Information Related to Restricted Stock (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, Beginning Balance	391,278	240,345
Granted, Shares	753,285	248,228
Vested, Shares	(396,073)	(92,115)
Forfeited, Shares	(48,066)	(5,180)
Non-vested shares outstanding, Ending Balance	700,424	391,278
Non-vested shares outstanding at December 31, Beginning Balance, Weighted Average Grant Date Fair Value	$ 25.40	$ 16.16
Granted, Weighted Average Grant Date Fair Value	$ 29.66	$ 30.99
Vested, Weighted Average Grant Date Fair Value	$ 26.04	$ 16.24
Forfeited, Weighted Average Grant Date Fair Value	$ 31.15	$ 27.40
Non-vested shares outstanding at December 31, Ending Balance, Weighted Average Grant Date Fair Value per Share	$ 29.22	$ 25.40

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

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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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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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