Shareholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stockholders Equity Note [Line Items]
Repurchase and retirement of common stock			$ 62,462,000
Repurchase and retirement of common stock, shares			1,442,000
Repurchase of common stock, shares authorized to repurchase	4,795,000		4,795,000
Cash dividend paid	$ 0.225
Cash dividend paid, Payment date	Aug. 15, 2011
Cash dividend paid, record date	Aug. 01, 2011
Cash dividend declared	$ 0.225		$ 0.225
Cash dividend declared, date	Oct. 20, 2011
Cash dividends declared, payable date	Nov. 15, 2011
Cash dividends declared, record date	Nov. 01, 2011
Common stock excluded from calculation of diluted earnings per share	44,000	738,000	530,000	1,236,000

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Stockholders Equity Note [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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