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Fair Value Of Financial Instruments (Narrative) (Detail) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Cash Surrender Value [Member] | Mar. 31, 2013 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Mar. 31, 2013 Convertible Debt [Member] Total Remaining Original Convertible Notes [Member] | Mar. 31, 2013 Senior Notes [Member] Unsecured Debt [Member] 4.875% Senior Notes [Member] | Mar. 31, 2013 Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member] | Mar. 31, 2013 Auction Rate Securities [Member] | Mar. 31, 2013 Earn-out Arrangements [Member] | Mar. 31, 2013 Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value measurements, valuation techniques |  |  | Cash surrender values of life insurance policies are based on current cash surrender values as quoted by insurance carriers. | The estimated fair value of the debt component of the Company’s New Convertible Notes is calculated using an income approach, based on a discounted cash flow model. | The estimated fair values of the Company’s 4.875% senior notes, 7.625% senior notes and Original Notes, which are measured on a nonrecurring basis, are based on quoted market prices, a Level 1 input. | The estimated fair values of the Company’s 4.875% senior notes, 7.625% senior notes and Original Convertible Notes, which are measured on a nonrecurring basis, are based on quoted market prices, a Level 1 input. | The estimated fair values of the Company’s 4.875% senior notes, 7.625% senior notes and Original Notes, which are measured on a nonrecurring basis, are based on quoted market prices, a Level 1 input. | The fair value of the Company’s auction rate securities was estimated by an independent valuation firm, Houlihan Capital Advisors, LLC, using a probability weighted discounted cash flow model. | The fair value of such acquisition-related contingent consideration is based on management’s estimates and entity-specific assumptions and is evaluated on an on-going basis. | The fair value of deferred compensation plan liabilities is based on quoted market prices of the employees' underlying investment selections.
Fair value measurements, significant assumptions |  |  |  | This method is based on management’s estimates of the Company’s market interest rate for a similar nonconvertible instrument. |  |  |  |  |  |
Assets measured at fair value on a nonrecurring basis, not separately disclosed | $ 0 | $ 0 |  |  |  |  |  |  |  |
Liabilities measured at fair value on a nonrecurring basis, not separately disclosed | $ 0 | $ 0 |  |  |  |  |  |  |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity. + References No definition available. + Details
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