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Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 455,686	$ 414,762
United States
Disaggregation of Revenue [Line Items]
Revenues	385,991	350,255
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	40,394	37,183
Canada
Disaggregation of Revenue [Line Items]
Revenues	12,784	11,999
Ireland
Disaggregation of Revenue [Line Items]
Revenues	16,388	15,163
Other
Disaggregation of Revenue [Line Items]
Revenues	129	162
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	119,694	116,893
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	108,516	96,440
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	125,530	106,676
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	50,876	46,153
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	31,516	32,420
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	5,554	3,989
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	14,000	12,191
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	117,608	113,221
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	75,095	74,014
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	26,665	24,359
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	11,482	10,401
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,366	4,447
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	32,564	32,844
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	473	347
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	369	475
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	50,876	46,153
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	27,810	29,169
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,407	2,715
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,109	1,518
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	113,294	102,321
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	113,294	102,321
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	72,654	70,180
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	34,714	27,420
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	5,926	4,721
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	84,499	79,203
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	66,720	62,089
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,729	12,824
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,302	1,598
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,619	2,530
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	129	162
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	14,088	13,317
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	69,943	65,710
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	468	176
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	136,419	116,629
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	127,016	108,443
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues	9,403	8,186
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	59	193
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	125,161	106,201
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	3,706	3,251
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,147	1,274
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	6,346	5,710
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	3,866	3,388
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	3,866	3,388
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	329	359
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	3,386	2,963
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 151	$ 66

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