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Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Amount related to soft-dollar arrangements										$ 16,680	$ 14,623
Revenues	$ 423,225	$ 416,254	$ 409,586	$ 400,820	$ 405,057	$ 408,682	$ 404,830	$ 405,598	$ 1,649,885	1,624,167	1,526,552
United States
Disaggregation of Revenue [Line Items]
Revenues									1,385,744	1,348,130	1,298,381
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									155,102	168,451
Canada
Disaggregation of Revenue [Line Items]
Revenues									50,550	54,467
Ireland
Disaggregation of Revenue [Line Items]
Revenues									57,637	51,316
Other
Disaggregation of Revenue [Line Items]
Revenues									852	1,803
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									474,541	488,330
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									382,938	376,707
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									404,842	361,899
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									177,046	184,587
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									143,697	145,820
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									20,896	23,923
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									45,925	42,901
Private Banks
Disaggregation of Revenue [Line Items]
Revenues									470,276	483,097	474,272
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues									304,860	304,762
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									102,518	112,980
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues									43,661	45,941
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues									19,237	19,414
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									135,503	138,616
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									1,616	793
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									1,634	1,517
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									177,046	182,068
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									132,661	136,222
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									15,687	16,643
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									6,129	7,238
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues									403,778	399,089	373,473
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues									403,778	399,089
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									282,253	288,030
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									103,428	94,526
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									18,097	16,533
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues									322,062	333,299	322,457
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues									252,149	257,080
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									52,584	55,471
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues									6,889	8,526
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues									9,588	10,419
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues									852	1,803
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									54,726	59,739
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									266,323	271,600
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									1,013	1,960
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues									440,796	398,076	349,444
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues									411,984	376,593
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									28,812	21,483
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									766	928
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									0	331
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									403,208	360,382
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									0	2,519
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									11,036	9,598
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									5,209	7,280
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									20,577	17,038
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues									12,973	10,606	$ 6,906
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues									12,973	10,606
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									1,293	1,017
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									11,571	9,457
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									$ 109	$ 132

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Expense Related To Soft Dollar Arrangement

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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