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Revenues from Contracts with Customers (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 405,057,000	$ 408,682,000	$ 404,830,000	$ 405,598,000	$ 408,219,000	$ 386,018,000	$ 372,331,000	$ 359,984,000	$ 1,624,167,000	$ 1,526,552,000	$ 1,401,545,000
Deferred contract costs	$ 24,007,000				$ 0				24,007,000	0
Capitalized contract cost, amount capitalized during period									8,122,000
Amortization of deferred contract costs									2,756,000
Capitalized contract cost impairment									0
United States
Disaggregation of Revenue [Line Items]
Revenues									1,348,130,000	1,298,381,000	1,191,640,000
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									168,451,000
Canada
Disaggregation of Revenue [Line Items]
Revenues									54,467,000
Ireland
Disaggregation of Revenue [Line Items]
Revenues									51,316,000
Other
Disaggregation of Revenue [Line Items]
Revenues									1,803,000
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									488,330,000
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									376,707,000
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									361,899,000
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									184,587,000
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									145,820,000
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									23,923,000
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									42,901,000
Private Banks
Disaggregation of Revenue [Line Items]
Revenues									483,097,000	474,272,000	457,886,000
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues									304,762,000
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									112,980,000
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues									45,941,000
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues									19,414,000
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues									0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									138,616,000
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									793,000
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									1,517,000
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									182,068,000
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									136,222,000
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									16,643,000
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									7,238,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues									399,089,000	373,473,000	330,677,000
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues									399,089,000
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									288,030,000
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									94,526,000
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									16,533,000
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues									333,299,000	322,457,000	312,584,000
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues									257,080,000
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									55,471,000
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues									8,526,000
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues									10,419,000
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues									1,803,000
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									59,739,000
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									271,600,000
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									0
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									1,960,000
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues									398,076,000	349,444,000	294,390,000
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues									376,593,000
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues									21,483,000
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues									0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									928,000
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									331,000
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									360,382,000
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									2,519,000
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									9,598,000
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									7,280,000
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									17,038,000
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues									10,606,000	$ 6,906,000	$ 6,008,000
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues									10,606,000
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues									1,017,000
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues									9,457,000
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues									0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues									$ 132,000
Retained Earnings | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Cumulative effect adjustment, before tax												$ 18,641,000

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