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Revenues from Contracts with Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 404,830,000	$ 372,331,000	$ 810,428,000	$ 732,315,000
Deferred contract costs	21,521,000		21,521,000		$ 0
Capitalized contract cost, amount capitalized during period	2,267,000		4,083,000
Amortization of deferred contract costs	619,000		1,201,000
Capitalized contract cost impairment			0
United States
Disaggregation of Revenue [Line Items]
Revenues	335,266,000		671,014,000
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	42,899,000		85,211,000
Canada
Disaggregation of Revenue [Line Items]
Revenues	13,650,000		27,922,000
Ireland
Disaggregation of Revenue [Line Items]
Revenues	12,684,000		25,112,000
Other
Disaggregation of Revenue [Line Items]
Revenues	331,000		1,169,000
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	123,468,000		247,159,000
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	93,840,000		187,795,000
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	88,686,000		176,523,000
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	44,557,000		89,625,000
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	37,823,000		74,790,000
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	6,176,000		13,482,000
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	10,280,000		21,054,000
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	121,126,000	116,184,000	243,290,000	228,818,000
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	75,669,000		153,802,000
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	29,005,000		56,530,000
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	11,516,000		23,117,000
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,936,000		9,841,000
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	35,164,000		70,354,000
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	214,000		412,000
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	375,000		757,000
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	43,915,000		88,500,000
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	35,453,000		70,055,000
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,195,000		9,614,000
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,810,000		3,598,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	99,890,000	92,746,000	199,082,000	180,984,000
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	99,890,000		199,082,000
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	72,481,000		144,899,000
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	23,389,000		46,153,000
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	4,020,000		8,030,000
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	83,434,000	78,068,000	168,925,000	155,072,000
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	64,048,000		128,816,000
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	13,894,000		28,681,000
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	2,134,000		4,805,000
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	3,027,000		5,454,000
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	331,000		1,169,000
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	15,347,000		31,205,000
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	67,608,000		136,884,000
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	479,000		836,000
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	97,566,000	83,616,000	194,421,000	164,103,000
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	92,845,000		184,604,000
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	4,721,000		9,817,000
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	239,000		239,000
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	80,000		163,000
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	88,311,000		175,766,000
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	642,000		1,125,000
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,370,000		4,735,000
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,981,000		3,868,000
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	3,943,000		8,525,000
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	2,814,000	$ 1,717,000	4,710,000	$ 3,338,000
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	2,814,000		4,710,000
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	237,000		462,000
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	2,549,000		4,183,000
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	$ 28,000		$ 65,000

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