Acquisitions, Dispositions and Goodwill (Details Textuals) (USD $)	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2011	Mar. 31, 2011	Jun. 30, 2009	Sep. 30, 2009	Dec. 31, 2011	Dec. 31, 2010
Acquisitions Dispositions And Goodwill [Abstract]
Earnout and other	$ 31,300,000	$ 20,000,000			$ 51,166,000	$ (52,000)
Projected net amount due related to prior acquisition						20,000,000
Potential amount contractually due to former owners from acquisition					22,700,000
HCC Global earnout and related goodwill recognized from the acquisition date					255,600,000
Cash received for sale of inactive subsidiary						14,700,000
Gain realized on sale of inactive subsidiary				4,700,000		500,000
Reduction of goodwill related to sale of agency			18,000,000	41,900,000
Sale of Stock, Percentage of Ownership before Transaction			100.00%
Sale of Stock, Consideration Received Per Transaction				42,500,000
Amount of assets sold in a disposition				142,200,000
Amount of liabilities sold in a disposition				$ 165,600,000