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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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