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Equity-Based Compensation - Summary of Restricted Stock (Detail) (Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at January 1, 2012, shares	1,959
Granted, shares	1,250	1,100	1,000
Vested, shares	(934)	(800)	(700)
Forfeited, shares	(81)
Unvested shares, shares	2,194	1,959
Unvested, Weighted Average Grant Date Fair Value (Per share), Beginning of Period	$ 20.79
Granted, Weighted Average Grant Date Fair Value (Per share)	$ 21.84	$ 21.38	$ 19.20
Vested, Weighted Average Grant Date Fair Value (Per share)	$ 20.98
Forfeited, Weighted Average Grant Date Fair Value (Per share)	$ 21.23
Unvested, Weighted Average Grant Date Fair Value (Per share), End of Period	$ 21.29	$ 20.79

X

- Definition

Share based compensation arrangement by share based payment award equity instruments other than option forfeited in period weighted average grant date fair value.

+ References

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- 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

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

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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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