Consolidated and Combined Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net income (loss)	$ 120,217	$ 32,555	$ 70,225
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Bad debt expense	1,213	1,450	1,564
Depreciation and amortization	2,635	2,268	2,296
(Income) loss from equity method investments	(4,476)	2,185	(3,681)
Equity-based compensation	46,131	119,756	49,359
Deferred tax provision	796	(753)	261
Other	540	3,235	2,763
Changes in assets and liabilities:
Accounts receivable	(7,993)	4,604	5,805
Other receivables	(5,448)	371	1,175
Prepaid expenses and other assets	(5,166)	1,990	(7,403)
Deferred compensation	(3,420)	(2,456)	2,811
Compensation payable	(10,618)	33,601	(16,728)
Accounts payable and accrued expenses	1,751	11,103	238
Deferred revenue	1,855	(1,682)	4,179
Dividends received	4,415		2,375
Other liabilities	(130)	684	2,418
Net cash provided by (used in) operating activities	142,302	208,911	117,657
Cash flows from investing activities
Purchase of investments	(157,981)	(130,994)	(145,230)
Proceeds from sales of investments	160,001	157,235	218,142
Return of capital from equity method investments	254
Investment in equity method investments		(4,445)
Note payments received from employees		831	383
Notes issued to employees		(119)
Purchase of equipment and leasehold improvements	(3,996)	(3,888)	(1,623)
Change in restricted cash	(18)	(81)	(4)
Net cash provided by (used in) investing activities	(1,740)	18,539	71,668
Cash flows from financing activities
Dividends and distributions	(80,909)	(123,223)	(40,130)
Purchase of treasury stock	(7,616)
Payments under tax receivable agreement	(1,587)
Excess tax benefits from equity-based compensation	462
Class A partnership units and other equity purchased	(90)
Pre-offering distribution to partners		(195,017)
IPO related proceeds (net of $10,316 of offering costs)		163,682
Dividend distributions to Parent for partners			(35,389)
Distributions of IPO proceeds to partners		(139,429)
Other cash contributions from (distributions to) Parent		(34,730)	2,016
Cash proceeds from issuance of Class B common stock		500
Other		(938)
Net cash provided by (used in) financing activities	(89,740)	(329,155)	(73,503)
Effect of exchange rate fluctuations on cash and cash equivalents	(744)	(3,375)	1,579
Net increase (decrease) in cash and cash equivalents	50,078	(105,080)	117,401
Cash and cash equivalents, beginning of period	197,944	303,024	185,623
Cash and cash equivalents, end of period	248,022	197,944	303,024
Cash paid during the period for:
Income taxes	26,000	5,649	1,422
Other non-cash activity
Class A Partnership Units or other equity converted into Class A Common Stock	4,726
Dividend equivalents issued	4,130
Forfeiture of fully-vested Group LP units	1,075
Non-cash settlement of accounts receivable	$ 635		2,828
Initial establishment of deferred tax assets, net of amounts payable under tax receivable agreement		10,854
Increase in deferred tax assets resulting from Secondary Offering, net of amounts payable under tax receivable agreement		20,711
Capitalized offering costs paid in prior or subsequent period		1,575
Tax benefit related to settlement of appreciation units		4,308
Establishment of deferred tax asset related to reorganization		3,261
Increase in deferred tax asset related to IPO		1,302
Other non-cash distributions		$ 1,560
Non-cash contribution from Parent			$ 757