Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended	1 Months Ended
Mar. 31, 2013	Apr. 30, 2013 Subsequent Event	Feb. 19, 2013 Cash Dividends	Apr. 30, 2013 Cash Dividends Subsequent Event
Stockholders' Equity [Line Items]
Dividend declaration date			Feb. 19, 2013	Apr. 30, 2013
Cash dividend declared per share			$ 0.24	$ 0.24
Dividend payable date			Apr. 18, 2013	Jul. 02, 2013
Record date			Mar. 21, 2013	Jun. 06, 2013
Number of shares repurchased	312,309
Average repurchase price per share	$ 31.92
Aggregate purchase price of common stock repurchased	$ 9,970,000
Value of remaining shares to be repurchased	37,000,000	137,000,000
Increase to share repurchase program		$ 100,000,000

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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No definition available.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Name Accounting Research Bulletin (ARB)

-Number 43

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The amount authorized by an entity's Board of Directors under a stock repurchase plan.

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The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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