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Revenues from Contracts with Customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 408,682,000	$ 386,018,000	$ 1,219,110,000	$ 1,118,333,000
Deferred contract costs	22,104,000		22,104,000			$ 0
Capitalized contract cost, amount capitalized during period	1,400,000		5,483,000
Amortization of deferred contract costs	819,000		2,020,000
Capitalized contract cost impairment			0
United States
Disaggregation of Revenue [Line Items]
Revenues	338,413,000		1,009,427,000
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	42,464,000		127,675,000
Canada
Disaggregation of Revenue [Line Items]
Revenues	13,625,000		41,547,000
Ireland
Disaggregation of Revenue [Line Items]
Revenues	13,855,000		38,967,000
Other
Disaggregation of Revenue [Line Items]
Revenues	325,000		1,494,000
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	123,647,000		370,806,000
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	95,760,000		283,555,000
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	92,566,000		269,089,000
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	45,460,000		135,085,000
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	35,342,000		110,132,000
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	5,200,000		18,682,000
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	10,707,000		31,761,000
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	118,449,000	118,499,000	361,739,000	347,317,000
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	73,188,000		226,990,000
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	28,647,000		85,177,000
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	11,730,000		34,847,000
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,884,000		14,725,000
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	34,897,000		105,251,000
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	197,000		609,000
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	381,000		1,138,000
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	44,836,000		133,336,000
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	32,925,000		102,980,000
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	3,408,000		13,022,000
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,805,000		5,403,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	102,550,000	94,318,000	301,632,000	275,302,000
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	102,550,000		301,632,000
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	73,663,000		218,562,000
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	24,525,000		70,678,000
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	4,362,000		12,392,000
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	83,466,000	80,411,000	252,391,000	235,483,000
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	64,601,000		193,417,000
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,817,000		42,498,000
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,895,000		6,700,000
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,828,000		8,282,000
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	325,000		1,494,000
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	14,614,000		45,819,000
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	68,318,000		205,202,000
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	534,000		1,370,000
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	101,275,000	91,020,000	295,696,000	255,123,000
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	95,132,000		279,736,000
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	6,143,000		15,960,000
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	206,000		445,000
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	79,000		242,000
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	92,185,000		267,951,000
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	624,000		1,749,000
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,417,000		7,152,000
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,792,000		5,660,000
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	3,972,000		12,497,000
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	2,942,000	$ 1,770,000	7,652,000	$ 5,108,000
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	2,942,000		7,652,000
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	267,000		729,000
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,641,000		6,824,000
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	$ 34,000		$ 99,000
Retained Earnings | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Cumulative effect adjustment, before tax					$ 18,641,000

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