Fair Value Of Financial Instruments (Narrative) (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Cash Surrender Value [Member]	Dec. 31, 2012 7.625% Senior Notes [Member]	Dec. 31, 2012 Convertible Debt [Member] Total New Senior Convertible Notes [Member]	Dec. 31, 2012 Convertible Debt [Member] Total Remaining Original Convertible Notes [Member]	Dec. 31, 2012 Auction Rate Securities [Member]	Dec. 31, 2012 Earn-out Arrangements [Member]	Dec. 31, 2012 Carrying Amount [Member] 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. Life insurance policies support the Company’s split dollar agreements and deferred compensation plan assets.	The estimated fair values of the Company’s 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 value of the debt component of the Company’s New Notes is calculated using an income approach, based on a discounted cash flow model.	The estimated fair values of the Company’s, 7.625% senior notes and Original Notes are based on quoted market prices.	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 underlying employees' 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