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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Assets
Restricted cash	$ 225,298	$ 119,724	$ 108,180
Investment securities — trading	76,108	42,267
Money Market Funds [Member]
Assets
Investment securities — trading	0	110
Equity securities
Assets
Investment securities — trading	2,505	8
U.S. Treasury Securities [Member]
Assets
Investment securities — trading	40,029	28,511
Mutual Funds [Member]
Assets
Investment securities — trading	33,559	13,627
Recurring
Assets
Cash equivalents	104,377	53,672
Restricted cash	127,585	100,368
Investment securities — trading	76,108	42,267
Other assets	1,471,620	1,139,515
Total assets at fair value	2,601,024	2,007,986
Liabilities
Securities sold, but not yet purchased	174	169
Other liabilities	495,895	475,750
Total liabilities at fair value	495,895	475,750
Recurring | Federal Or Other Regulations
Assets
Cash equivalents	821,334	672,164
Recurring | Mutual funds
Liabilities
Securities sold, but not yet purchased		18
Recurring | Equity securities
Liabilities
Securities sold, but not yet purchased	174	151
Recurring | Money Market Funds [Member]
Assets
Investment securities — trading		110
Recurring | Mutual funds
Assets
Investment securities — trading	33,559	13,627
Recurring | Equity securities
Assets
Investment securities — trading	2,505	8
Recurring | U.S. Treasury Securities [Member]
Assets
Investment securities — trading	40,029	28,511
Recurring | Debt Securities [Member]
Assets
Investment securities — trading	15	11
Recurring | Deferred compensation plan
Assets
Other assets	1,097,514	856,843
Recurring | Other investments
Assets
Other assets	2,423	3,989
Recurring | Fractional Shares
Assets
Other assets	371,683	278,683
Liabilities
Other liabilities	371,683	278,683
Recurring | Contingent Consideration
Liabilities
Other liabilities	124,038	196,898
Recurring | Level 1
Assets
Restricted cash	127,585	100,368
Investment securities — trading	76,093	42,256
Other assets	1,469,197	1,135,526
Total assets at fair value	2,598,586	2,003,986
Liabilities
Securities sold, but not yet purchased	174	151
Other liabilities	371,857	278,834
Total liabilities at fair value	371,857	278,834
Recurring | Level 1 | Federal Or Other Regulations
Assets
Cash equivalents	821,334
Recurring | Level 1 | Equity securities
Liabilities
Securities sold, but not yet purchased	174	151
Recurring | Level 1 | Debt Securities [Member]
Liabilities
Securities sold, but not yet purchased		0
Recurring | Level 1 | Money Market Funds [Member]
Assets
Investment securities — trading		110
Recurring | Level 1 | Mutual funds
Assets
Investment securities — trading		13,627
Recurring | Level 1 | Equity securities
Assets
Investment securities — trading	2,505	8
Recurring | Level 1 | U.S. Treasury Securities [Member]
Assets
Investment securities — trading	40,029	28,511
Recurring | Level 1 | Debt Securities [Member]
Assets
Investment securities — trading		0
Recurring | Level 1 | Deferred compensation plan
Assets
Other assets	1,097,514	856,843
Recurring | Level 1 | Other investments
Assets
Other assets	0	0
Recurring | Level 1 | Fractional Shares
Assets
Other assets	371,683	278,683
Liabilities
Other liabilities	371,683
Obligations, Fair Value Disclosure		278,683
Recurring | Level 1 | Contingent Consideration
Liabilities
Other liabilities	0	0
Recurring | Level 1 | Cash Equivalents Not Subject To Segregation
Assets
Cash equivalents	104,377	53,672
Recurring | Level 1 | Other Security Investments
Assets
Investment securities — trading	0
Recurring | Level 1 | Cash Equivalents Segregated Under Federal Or Other Regulations | Federal Or Other Regulations
Assets
Cash equivalents		672,164
Recurring | Level 1 | Mutual Funds [Member]
Assets
Investment securities — trading	33,559
Recurring | Level 2
Assets
Restricted cash	0	0
Investment securities — trading	15	11
Other assets	2,423	3,989
Total assets at fair value	2,438	4,000
Liabilities
Securities sold, but not yet purchased	0	18
Other liabilities	0	18
Total liabilities at fair value	0	18
Recurring | Level 2 | Federal Or Other Regulations
Assets
Cash equivalents	0	0
Recurring | Level 2 | Equity securities
Liabilities
Securities sold, but not yet purchased	0	0
Recurring | Level 2 | Debt Securities [Member]
Liabilities
Securities sold, but not yet purchased	15	18
Recurring | Level 2 | Money Market Funds [Member]
Assets
Investment securities — trading	0	0
Recurring | Level 2 | Mutual funds
Assets
Investment securities — trading	0	0
Recurring | Level 2 | Equity securities
Assets
Investment securities — trading		0
Recurring | Level 2 | U.S. Treasury Securities [Member]
Assets
Investment securities — trading	0	0
Recurring | Level 2 | Debt Securities [Member]
Assets
Investment securities — trading	15	11
Recurring | Level 2 | Deferred compensation plan
Assets
Other assets	0	0
Recurring | Level 2 | Other investments
Assets
Other assets	2,423	3,989
Recurring | Level 2 | Fractional Shares
Assets
Other assets	0	0
Liabilities
Other liabilities	0
Obligations, Fair Value Disclosure		0
Recurring | Level 2 | Contingent Consideration
Liabilities
Other liabilities	0
Obligations, Fair Value Disclosure		0
Recurring | Level 2 | Cash Equivalents Not Subject To Segregation
Assets
Cash equivalents	0	0
Recurring | Level 2 | Other Security Investments
Assets
Investment securities — trading		11
Recurring | Level 3
Assets
Restricted cash	0	0
Investment securities — trading	0	0
Other assets	0	0
Total assets at fair value	0	0
Liabilities
Securities sold, but not yet purchased	0	0
Other liabilities	124,038	196,898
Total liabilities at fair value	124,038	196,898
Recurring | Level 3 | Federal Or Other Regulations
Assets
Cash equivalents	0	0
Recurring | Level 3 | Equity securities
Liabilities
Securities sold, but not yet purchased	0	0
Recurring | Level 3 | Debt Securities [Member]
Liabilities
Securities sold, but not yet purchased		0
Recurring | Level 3 | Money Market Funds [Member]
Assets
Investment securities — trading	0	0
Recurring | Level 3 | Mutual funds
Assets
Investment securities — trading	0	0
Recurring | Level 3 | Equity securities
Assets
Investment securities — trading		0
Recurring | Level 3 | U.S. Treasury Securities [Member]
Assets
Investment securities — trading	0	0
Recurring | Level 3 | Debt Securities [Member]
Assets
Investment securities — trading		0
Recurring | Level 3 | Deferred compensation plan
Assets
Other assets	0	0
Recurring | Level 3 | Other investments
Assets
Other assets	0	0
Recurring | Level 3 | Fractional Shares
Assets
Other assets	0	0
Liabilities
Other liabilities	0
Obligations, Fair Value Disclosure		0
Recurring | Level 3 | Contingent Consideration
Liabilities
Other liabilities	124,038
Obligations, Fair Value Disclosure		196,898
Recurring | Level 3 | Cash Equivalents Not Subject To Segregation
Assets
Cash equivalents	0	$ 0
Recurring | Level 3 | Other Security Investments
Assets
Investment securities — trading	$ 0

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