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Revenues from Contracts with Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 405,598,000
Deferred contract costs	19,875,000	$ 0
Capitalized contract cost impairment	0
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	335,748,000
United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42,312,000
Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,272,000
Ireland [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,428,000
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	838,000
Investment Management Fees From Investment Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	123,691,000
Investment Management Fees From Investment Management Agreements [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	93,955,000
Investment Operations Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	87,837,000
Investment Processing Fees, PaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	45,068,000
Investment Processing Fees, SaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36,967,000
Professional Services Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,306,000
Account Fees And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,774,000
Private Banks [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	122,164,000
Private Banks [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78,133,000
Private Banks [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27,525,000
Private Banks [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,601,000
Private Banks [Member] | Ireland [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,905,000
Private Banks [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Private Banks [Member] | Investment Management Fees From Investment Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	35,190,000
Private Banks [Member] | Investment Management Fees From Investment Management Agreements [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	198,000
Private Banks [Member] | Investment Operations Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	382,000
Private Banks [Member] | Investment Processing Fees, PaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44,585,000
Private Banks [Member] | Investment Processing Fees, SaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34,602,000
Private Banks [Member] | Professional Services Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,419,000
Private Banks [Member] | Account Fees And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,788,000
Investment Advisors [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	99,192,000
Investment Advisors [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	99,192,000
Investment Advisors [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Ireland [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Investment Management Fees From Investment Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	72,418,000
Investment Advisors [Member] | Investment Management Fees From Investment Management Agreements [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22,764,000
Investment Advisors [Member] | Investment Operations Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Investment Processing Fees, PaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Investment Processing Fees, SaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Professional Services Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Advisors [Member] | Account Fees And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,010,000
Institutional Investors [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	85,491,000
Institutional Investors [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	64,768,000
Institutional Investors [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,787,000
Institutional Investors [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,671,000
Institutional Investors [Member] | Ireland [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,427,000
Institutional Investors [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	838,000
Institutional Investors [Member] | Investment Management Fees From Investment Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15,858,000
Institutional Investors [Member] | Investment Management Fees From Investment Management Agreements [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	69,276,000
Institutional Investors [Member] | Investment Operations Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Institutional Investors [Member] | Investment Processing Fees, PaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Institutional Investors [Member] | Investment Processing Fees, SaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Institutional Investors [Member] | Professional Services Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Institutional Investors [Member] | Account Fees And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	357,000
Investment Managers [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	96,855,000
Investment Managers [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	91,759,000
Investment Managers [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Managers [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Managers [Member] | Ireland [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,096,000
Investment Managers [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Managers [Member] | Investment Management Fees From Investment Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investment Managers [Member] | Investment Management Fees From Investment Management Agreements [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83,000
Investment Managers [Member] | Investment Operations Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	87,455,000
Investment Managers [Member] | Investment Processing Fees, PaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	483,000
Investment Managers [Member] | Investment Processing Fees, SaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,365,000
Investment Managers [Member] | Professional Services Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,887,000
Investment Managers [Member] | Account Fees And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,582,000
Investments In New Businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,896,000
Investments In New Businesses [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,896,000
Investments In New Businesses [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Ireland [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Investment Management Fees From Investment Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	225,000
Investments In New Businesses [Member] | Investment Management Fees From Investment Management Agreements [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,634,000
Investments In New Businesses [Member] | Investment Operations Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Investment Processing Fees, PaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Investment Processing Fees, SaaS [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Professional Services Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Investments In New Businesses [Member] | Account Fees And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 37,000

X

- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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