Consolidated Statements of Changes in Unitholders Capital - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,487,717	$ 2,020,617	$ 1,885,171
Cumulative-effect adjustment from adoption of accounting guidance				$ 48,709
Issuance of units		620,334
Change in deferred taxes resulting from increase in Class A ownership percentage			475
Repurchase and cancellation of units	(12,191)	(231,720)	(12,317)
Purchase of non-controlling interests in subsidiary		(2,916)
Restructuring equity distribution of entities	(500,629)
Deferred tax effect resulting from the purchase of OCGH units	203,511	7,103
Capital increase related to equity-based compensation	66,462	61,033	59,720
Distributions declared	(830,491)	(542,281)	(569,053)
Net income	293,718	505,475	659,950
Foreign currency translation adjustment, net of tax	(5,928)	1,363	(3,389)
Unrealized gain on interest-rate swap designated as cash-flow hedge, net of tax	0	0	60
Ending balance	1,702,169	2,487,717	2,020,617
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	893,043	788,413	749,618
Cumulative-effect adjustment from adoption of accounting guidance					$ (352)
Issuance of units		219,750
Change in deferred taxes resulting from increase in Class A ownership percentage			475
Repurchase and cancellation of units	(8,378)	(228,469)	(9,073)
Purchase of non-controlling interests in subsidiary		(1,320)
Restructuring equity distribution of entities	(413,074)
Deferred tax effect resulting from the purchase of OCGH units	203,511	7,103
Equity reallocation between controlling and non-controlling interests	306,015	80,106	23,151
Capital increase related to equity-based compensation	31,943	27,460	24,594
Distributions declared	(262,761)
Ending balance	750,299	893,043	788,413
Retained Earnings (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	100,683	80,128	54,494
Cumulative-effect adjustment from adoption of accounting guidance				20,355	$ 352
Distributions declared	(176,672)	(210,941)	(206,212)
Net income	127,523	211,141	231,494
Ending balance	51,534	100,683	80,128
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,053	443	1,793
Foreign currency translation adjustment, net of tax	(4,554)	610	(1,374)
Unrealized gain on interest-rate swap designated as cash-flow hedge, net of tax			24
Ending balance	(3,501)	1,053	443
Non-controlling Interests in Consolidated Subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,092,354	1,121,237	1,050,319
Cumulative-effect adjustment from adoption of accounting guidance				$ 28,354
Repurchase and cancellation of units	(3,813)	(3,251)	(3,244)
Purchase of non-controlling interests in subsidiary		(1,596)
Restructuring equity distribution of entities	(87,555)
Equity reallocation between controlling and non-controlling interests	(306,015)	(80,106)	(23,151)
Capital increase related to equity-based compensation	34,519	33,573	35,126
Distributions declared	(363,742)	(289,428)	(360,618)
Net income	138,879	282,818	424,784
Foreign currency translation adjustment, net of tax	(1,374)	753	(2,015)
Unrealized gain on interest-rate swap designated as cash-flow hedge, net of tax			36
Ending balance	503,253	1,092,354	1,121,237
Non-controlling Interests in Consolidated Funds
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	30,396	28,947
Distributions declared		(29,635)	(2,223)
Net income		(761)	3,672
Ending balance	$ 0	$ 0	$ 30,396
Class A Units | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	71,662	65,310	63,032
Issuance of units (in shares)	29,713	6,688	2,507
Cancellation of units associated with forfeitures (in shares)		(115)	(21)
Cancellation of units (in shares)	(3,149)
Repurchase and cancellation of units (in shares)	(259)	(221)	(208)
Ending balance (in shares)	97,967	71,662	65,310
Class B Units | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	85,472	90,976	91,758
Issuance of units (in shares)	5,153	182	524
Cancellation of units (in shares)	(3,429)	(582)	(1,221)
Repurchase and cancellation of units (in shares)	(25,403)	(5,104)	(85)
Ending balance (in shares)	61,793	85,472	90,976
Series A Preferred Units | Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 173,669	$ 0	$ 0
Issuance of units		173,669
Distributions declared	(11,924)	(6,890)
Net income	11,924	6,890
Ending balance	173,669	173,669	0
Series B Preferred Units | Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	226,915	0	0
Issuance of units		226,915
Distributions declared	(15,392)	(5,387)
Net income	15,392	5,387
Ending balance	$ 226,915	$ 226,915	$ 0