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Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 443,723	$ 424,927	$ 400,646	$ 414,762	$ 423,225	$ 416,254	$ 409,586	$ 400,820	$ 1,684,058	$ 1,649,885	$ 1,624,167
United States
Disaggregation of Revenue [Line Items]
Revenues									1,427,152	1,385,744	1,348,130
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									149,188	155,102	168,451
Canada
Disaggregation of Revenue [Line Items]
Revenues									47,372	50,550	54,467
Ireland
Disaggregation of Revenue [Line Items]
Revenues									59,792	57,637	51,316
Other
Disaggregation of Revenue [Line Items]
Revenues									554	852	1,803
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									454,841	474,541	488,330
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									392,171	382,938	376,707
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									449,321	404,842	361,899
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									184,711	177,046	184,587
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									126,751	143,697	145,820
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									27,347	20,896	23,923
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									48,916	45,925	42,901
Private Banks
Disaggregation of Revenue [Line Items]
Revenues									455,393	470,276	483,097
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues									298,708	304,860	304,762
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									97,896	102,518	112,980
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues									41,762	43,661	45,941
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues									17,027	19,237	19,414
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									127,883	135,503	138,616
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									1,470	1,616	793
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									1,804	1,634	1,517
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									184,711	177,046	182,068
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									113,012	132,661	136,222
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									21,594	15,687	16,643
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									4,919	6,129	7,238
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues									407,564	403,778	399,089
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues									407,564	403,778	399,089
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									271,627	282,253	288,030
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									115,887	103,428	94,526
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									20,050	18,097	16,533
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues									317,627	322,062	333,299
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues									250,321	252,149	257,080
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									51,292	52,584	55,471
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues									5,610	6,889	8,526
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues									9,850	9,588	10,419
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues									554	852	1,803
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									53,283	54,726	59,739
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									262,709	266,323	271,600
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									0	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									1,635	1,013	1,960
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues									489,462	440,796	398,076
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues									456,547	411,984	376,593
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									32,915	28,812	21,483
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									637	766	928
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									0	0	331
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									447,517	403,208	360,382
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									0	0	2,519
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									13,739	11,036	9,598
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									5,753	5,209	7,280
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									21,816	20,577	17,038
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues									14,012	12,973	10,606
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues									14,012	12,973	10,606
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									1,411	1,293	1,017
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									12,105	11,571	9,457
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									$ 496	$ 109	$ 132

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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