Commitments and Contingencies - Additional Information (Details) shares in Thousands		2 Months Ended		12 Months Ended
	Jul. 26, 2019 USD ($)	May 03, 2019 USD ($)	Mar. 02, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 24, 2016 USD ($)	Nov. 16, 2015	Jul. 31, 2015 USD ($) shares
Other Commitments [Line Items]
Number of Public Offerings							4
Unfunded Commitments for Capital Contributions				$ 13,767,000
Contractual Obligations Related To Tax Receivable Agreements				94,522,000
Payment To Counterparties To Tax Receivable Agreement Within One Year Or Less				9,570,000
Payment To Counterparties To Tax Receivable Agreement One To Three Years				19,994,000
Payment To Counterparties To Tax Receivable Agreement Three To Five Years				19,863,000
Payment To Counterparties To Tax Receivable Agreement After Five Years				45,095,000
Cash Paid For Contingent Consideration				2,008,000
Business Combination, Contingent Consideration, Liability				296,000
Asset Acquisition, Contingent Consideration, Liability				4,463,000	$ 4,463,000
Asset Acquisition, Contingent Consideration Arrangements, Change In Amount Of Contingent Consideration, Liability				400,000	$ 3,971,000
Underwritten Shares (in shares) | shares								293
Aggregate Offering Price								$ 30,800,000
BBVA Bancomer [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity				$ 7,920,000
BBVA Bancomer [Member] | Inter-Bank Balance Interest Rate [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.10%
Secured Line of Credit [Member] | PNC Bank [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity						$ 30,000,000
Amount Outstanding During Period		$ 30,000,000	$ 30,000,000
Secured Line of Credit [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.25%
Unsecured Line of Credit [Member] | PNC Bank [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity	$ 20,000,000
Unsecured Line of Credit [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%