Fair Value Of Financial Instruments (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Senior Notes [Member] Unsecured Debt [Member] Total Senior And Senior Convertible Notes [Member]	Mar. 31, 2013 Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member]	Sep. 30, 2013 Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member]	Sep. 30, 2013 Earn-out Arrangements [Member]	Sep. 30, 2013 Earn-out Arrangements [Member] 2013 Acquisitions [Member]	Sep. 30, 2013 Earn-out Arrangements [Member] Accumulated Translation Adjustment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments of contingent consideration								$ 2,700,000
Currency translation gains included in other comprehensive income, contingent consideration										1,100,000
Additions from new business combinations, contingent consideration									30,000,000
Fair value measurements, valuation techniques					The estimated fair values of the Company’s 4.875% senior notes, 7.625% senior notes, 2009 Convertible Notes and 2011 Convertible Notes are based on quoted market prices, a Level 1 input.
Loss on extinguishment of debt	$ 0	$ 0	$ 5,624,000	$ 0		$ 5,600,000	$ 5,600,000