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Summary of Status of Outstanding Performance Share Awards (Detail) (Performance shares, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Performance shares
Number of Share
Beginning Balance	638,870	524,588
Granted	110,668	141,522	562,182
Forfeited		(27,240)	(37,594)
Ending Balance	749,538	638,870	524,588
Weighted Average Grant Date Fair Value
Beginning Balance	$ 13.00	$ 5.64
Granted	$ 57.18	$ 39.36	$ 5.59
Forfeited		$ 8.14	$ 4.94
Ending Balance	$ 19.52	$ 13.00	$ 5.64
Aggregate Intrinsic Value
Aggregate intrinsic value (in thousands)	$ 26,691	$ 25,012	$ 14,418

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- Definition

Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Nonvested, Total Intrinsic Value

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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The 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 during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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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