Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	PRSU Additional Paid-In Capital	PRSU	RSU Additional Paid-In Capital	RSU	Members' Capital	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Non-Controlling Interests	Class A common stock	Class B common stock	Class C common stock	Class D common stock	Total
Members' capital beginning of period at Dec. 31, 2018					$ 4,573,200		$ (866)							$ 4,572,334
Comprehensive income:
Adjustment to Class C Shares and Class P© shares in mezzanine capital					(2,369)									(2,369)
Capital distributions					(20,000)									(20,000)
Stock-based compensation					4,674									4,674
Net income					42,352									42,352
Foreign currency translation adjustments							988							988
Members' capital end of period at Mar. 31, 2019					$ 4,597,857		122							4,597,979
Equity at beginning of period at Dec. 31, 2019						$ 3,329,386	1,366	$ 47,833	$ 1,214,157	$ 1	$ 1		$ 1	4,592,745
Equity at beginning of period ( in shares) at Dec. 31, 2019										66,408,328	96,933,192	8,328,983	50,853,172
Comprehensive income:
Activities related to exchanges of LLC Interests, net of offering costs and cancellations						(335)							$ (1)	(336)
Activities related to exchanges of LLC Interests, net of offering costs and cancellations (in shares)										1,920,941		(939,000)	(981,941)
Issuance of common stock from equity incentive plans						35,422								35,422
Issuance of common stock from equity incentive plans (in shares)										2,341,171
Tax receivable agreement liability and deferred taxes arising from LLC Interest ownership exchanges						32,736								32,736
Adjustments to non-controlling interests						45,436	7		(45,443)
Dividends ($0.08 per share)								(13,400)						(13,400)
Stock-based compensation expense under the PRSU Plan	$ 5,407	$ 5,407	$ 315	$ 315
Stock-based compensation expense under the Option Plan						2,249								2,249
Payroll taxes paid for stock-based compensation exercises						(23,991)								(23,991)
Net income								43,928	18,557					62,485
Foreign currency translation adjustments							(3,552)		(1,232)					(4,784)
Equity at end of period at Mar. 31, 2020						$ 3,426,625	$ (2,179)	$ 78,361	$ 1,186,039	$ 1	$ 1			$ 4,688,848
Equity at end of period (in shares) at Mar. 31, 2020										70,670,440	96,933,192	7,389,983	49,871,231