Note 6 - Equity-Based Compensation (Detail) - Summary of Stock Option Activity (USD $) In Millions, except Share data	Stock Options [Member] USD ($)	Weighted Average Exercise Price [Member]	Aggregate Intrinsic Value [Member] USD ($)
Outstanding at January 1, 2011 (in Shares) at Dec. 31, 2010	1,198,516
Outstanding at January 1, 2011 at Dec. 31, 2010		18.42
Granted (in Shares)	225,505
Granted		26.92
Exercised (in Shares)	(119,559)
Exercised		16.66
Canceled/Expired (in Shares)	(145,376)
Canceled/Expired		27.80
Exercisable at June 30, 2011 (in Dollars) at Jun. 30, 2011			$ 3.5
Outstanding at June 30, 2011 (in Dollars) at Jun. 30, 2011			$ 4.3
Outstanding at June 30, 2011 (in Shares) at Jun. 30, 2011	1,159,086
Exercisable at June 30, 2011 (in Shares) at Jun. 30, 2011	706,332
Outstanding at June 30, 2011 at Jun. 30, 2011		19.07
Exercisable at June 30, 2011 at Jun. 30, 2011		16.86

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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