Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Commissions	$ 475,087	$ 415,283
Principal transactions	92,439	69,768
Real estate management services	46,058	40,602
Fees from related parties	7,070	6,606
Data, software and post-trade	12,317	11,527
Interest income	2,383	1,705
Other revenues	3,682	2,076
Total revenues	639,036	547,567
Expenses:
Compensation and employee benefits	409,183	346,584
Allocations of net income and grant of exchangeability to limited partnership units and FPUs	32,924	37,054
Total compensation and employee benefits	442,107	383,638
Occupancy and equipment	50,002	42,965
Fees to related parties	6,209	4,567
Professional and consulting fees	15,410	23,281
Communications	30,908	24,937
Selling and promotion	25,598	20,476
Commissions and floor brokerage	9,043	6,278
Interest expense	13,458	15,902
Other expenses	22,811	21,041
Total expenses	615,546	543,085
Other income (losses), net:
Gain (loss) on divestiture and sale of investments		(215)
Gains (losses) on equity method investments	558	803
Other income (loss)	(2,917)	31,200
Total other income (losses), net	(2,359)	31,788
Income from operations before income taxes	21,131	36,270
Provision for income taxes	4,840	10,046
Consolidated net income	16,291	26,224
Less: Net income attributable to noncontrolling interest in subsidiaries	2,632	12,169
Net income available to common stockholders	13,659	14,055
Basic earnings per share
Net income available to common stockholders	$ 13,659	$ 14,055
Basic earnings per share	$ 0.05	$ 0.06
Basic weighted-average shares of common stock outstanding	273,780	222,019
Fully diluted earnings per share
Net income for fully diluted shares	$ 22,203	$ 20,741
Fully diluted earnings per share	$ 0.05	$ 0.06
Fully diluted weighted-average shares of common stock outstanding	434,855	338,484
Dividends declared per share of common stock	$ 0.14	$ 0.12
Dividends declared and paid per share of common stock	$ 0.14	$ 0.12