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Earnings Per Share (Schedule Of Convertible Debt Information) (Detail) (Convertible Debt [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
New 4.0% Notes [Member] |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | $ 105,322 | [1] | $ 105,322 | [1] | $ 105,322 | [1] | $ 105,322 | [1] | $ 105,300
Conversion price per share | $ 15.76 |  | $ 15.76 |  | $ 15.76 |  | $ 15.76 |  |
Number of conversion shares, principal amount | 6,683 |  | 6,683 |  | 6,683 |  | 6,683 |  |
Excess over principal amount | 96,021 |  | 4,261 |  | 91,325 |  | 9,345 |  |
Weighted average equivalent premium shares | 3,187 |  | 260 |  | 3,104 |  | 545 |  |
New 4.25% Notes [Member] |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | 97,000 | [1] | 97,000 | [1] | 97,000 | [1] | 97,000 | [1] | 97,000
Conversion price per share | $ 15.48 |  | $ 15.48 |  | $ 15.48 |  | $ 15.48 |  |
Number of conversion shares, principal amount | 6,268 |  | 6,268 |  | 6,268 |  | 6,268 |  |
Excess over principal amount | $ 91,837 |  | $ 5,777 |  | $ 87,433 |  | $ 10,545 |  |
Weighted average equivalent premium shares | 3,048 |  | 352 |  | 2,971 |  | 615 |  |
Weighted Average [Member] | New 4.0% Notes [Member] |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Weighted average actual per share price | $ 30.13 |  | $ 16.40 |  | $ 29.43 |  | $ 17.16 |  |
Weighted Average [Member] | New 4.25% Notes [Member] |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Weighted average actual per share price | $ 30.13 |  | $ 16.40 |  | $ 29.43 |  | $ 17.16 |  |
[1] | Dilutive shares associated with the New Convertible Notes are attributable to the weighted average premium value, in shares, of the conversion shares underlying the New Convertible Notes in excess of the respective principal amounts thereof.

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 32 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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