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Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Parenthetical) (Detail) (5.0% Convertible Senior Notes [Member])
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Sep. 30, 2012
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Aug. 31, 2012
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5.0% Convertible Senior Notes [Member]
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| Schedule Of Earnings Per Share [Line Items] | ||
| Stated Interest rate on debt agreement | 5.00% | 5.00% |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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