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Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 400,820	$ 405,598
United States
Disaggregation of Revenue [Line Items]
Revenues	335,636	335,748
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	38,816	42,312
Canada
Disaggregation of Revenue [Line Items]
Revenues	12,387	14,272
Ireland
Disaggregation of Revenue [Line Items]
Revenues	13,697	12,428
Other
Disaggregation of Revenue [Line Items]
Revenues	284	838
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	113,771	123,691
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	93,409	93,955
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	95,243	87,837
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,911	45,068
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	37,257	36,967
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	5,194	7,306
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	12,035	10,774
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	118,259	122,164
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	77,454	78,133
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	25,350	27,525
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	10,660	11,601
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,795	4,905
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	32,973	35,190
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	702	198
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	376	382
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,911	44,585
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	34,708	34,602
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	3,777	5,419
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,812	1,788
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	94,761	99,192
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	94,761	99,192
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	66,623	72,418
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	23,838	22,764
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	4,300	4,010
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	80,113	85,491
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	62,325	64,768
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,466	14,787
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,727	2,671
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,311	2,427
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	284	838
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	13,661	15,858
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	66,171	69,276
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	281	357
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	104,649	96,855
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	98,058	91,759
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	6,591	5,096
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	205	0
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	83
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	94,867	87,455
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	483
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,549	2,365
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,417	1,887
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	5,611	4,582
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	3,038	1,896
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	3,038	1,896
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	309	225
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,698	1,634
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	$ 31	$ 37

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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