Fair Value Of Financial Instruments (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012 DirectStar Business [Member]	Jun. 30, 2012 DirectStar Business [Member]	Jun. 30, 2013 Unsecured Debt [Member] Total Senior And Senior Convertible Notes [Member]	Mar. 31, 2013 Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member]	Jun. 30, 2013 Earn-out Arrangements [Member]	Jun. 30, 2013 Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Jun. 30, 2013 Auction Rate Securities [Member]	Jun. 30, 2013 Cash Surrender Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements, valuation techniques							The estimated fair values of the Company’s 4.875% senior notes, 7.625% senior notes, New Convertible Notes and Original Convertible Notes, which are measured on a nonrecurring basis, are based on quoted market prices, a Level 1 input.		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.	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.	Cash surrender values of life insurance policies are based on current cash surrender values as quoted by insurance carriers.
Loss on extinguishment of debt	$ 0	$ 0	$ 5,624	$ 0				$ 5,600
Loss on disposal and impairment charges, discontinued operations				$ 248	$ 200	$ 200