Fair Value Of Financial Instruments (Narrative) (Detail) (USD $) In Millions, unless otherwise specified			3 Months Ended
	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