CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts receivables	$ 22,805	$ 23,017
Property, accumulated amortization and depreciation	226,570	225,861
Goodwill and other intangible assets, accumulated amortization	$ 36,158	$ 35,281
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Series A Preferred Stock [Member]
Preferred stock, shares issued	7,921	7,921
Preferred stock, shares outstanding	7,921	7,921
Series B Preferred stock [Member]
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	128,216,423	128,216,423
Common stock, shares outstanding	128,216,423	128,216,423
Common stock held by subsidiaries, shares	6,804,690	12,802,938
Class B Common stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1	1
Common stock, shares issued	1	1
Common stock, shares outstanding	1	1