Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 1,918,309	$ 1,684,058	$ 1,649,885
United States
Disaggregation of Revenue [Line Items]
Revenues	1,629,527	1,427,152	1,385,744
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	165,788	149,188	155,102
Canada
Disaggregation of Revenue [Line Items]
Revenues	52,721	47,372	50,550
Ireland
Disaggregation of Revenue [Line Items]
Revenues	69,770	59,792	57,637
Other
Disaggregation of Revenue [Line Items]
Revenues	503	554	852
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	495,378	454,841	474,541
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	458,087	392,171	382,938
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	539,958	449,321	404,842
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	215,473	184,711	177,046
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	128,963	126,751	143,697
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	25,562	27,347	20,896
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	54,888	48,916	45,925
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	493,570	455,393	470,276
Private Banks \| United States
Disaggregation of Revenue [Line Items]
Revenues	315,040	298,708	304,860
Private Banks \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	111,900	97,896	102,518
Private Banks \| Canada
Disaggregation of Revenue [Line Items]
Revenues	48,325	41,762	43,661
Private Banks \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	18,305	17,027	19,237
Private Banks \| Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Private Banks \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	134,617	127,883	135,503
Private Banks \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,271	1,470	1,616
Private Banks \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	1,512	1,804	1,634
Private Banks \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	215,473	184,711	177,046
Private Banks \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	113,964	113,012	132,661
Private Banks \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	22,054	21,594	15,687
Private Banks \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	3,679	4,919	6,129
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	482,949	407,564	403,778
Investment Advisors \| United States
Disaggregation of Revenue [Line Items]
Revenues	482,949	407,564	403,778
Investment Advisors \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	301,581	271,627	282,253
Investment Advisors \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	158,181	115,887	103,428
Investment Advisors \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Advisors \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	23,187	20,050	18,097
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	343,805	317,627	322,062
Institutional Investors \| United States
Disaggregation of Revenue [Line Items]
Revenues	274,867	250,321	252,149
Institutional Investors \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	53,888	51,292	52,584
Institutional Investors \| Canada
Disaggregation of Revenue [Line Items]
Revenues	4,396	5,610	6,889
Institutional Investors \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	10,151	9,850	9,588
Institutional Investors \| Other
Disaggregation of Revenue [Line Items]
Revenues	503	554	852
Institutional Investors \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	57,716	53,283	54,726
Institutional Investors \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	282,797	262,709	266,323
Institutional Investors \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Institutional Investors \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Institutional Investors \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	1,207	0	0
Institutional Investors \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Institutional Investors \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	2,085	1,635	1,013
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	581,157	489,462	440,796
Investment Managers \| United States
Disaggregation of Revenue [Line Items]
Revenues	539,843	456,547	411,984
Investment Managers \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Managers \| Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Managers \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	41,314	32,915	28,812
Investment Managers \| Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Managers \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	134	637	766
Investment Managers \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Managers \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	538,446	447,517	403,208
Investment Managers \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investment Managers \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	13,792	13,739	11,036
Investment Managers \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	3,508	5,753	5,209
Investment Managers \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	25,277	21,816	20,577
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	16,828	14,012	12,973
Investments In New Businesses \| United States
Disaggregation of Revenue [Line Items]
Revenues	16,828	14,012	12,973
Investments In New Businesses \| United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	1,330	1,411	1,293
Investments In New Businesses \| Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	14,838	12,105	11,571
Investments In New Businesses \| Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Investments In New Businesses \| Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 660	$ 496	$ 109