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Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 424,927 | $ 416,254 | $ 1,240,335 | $ 1,226,660
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 360,234 | 351,609 | 1,050,704 | 1,030,764
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 38,164 | 37,321 | 109,972 | 114,972
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,894 | 12,728 | 35,050 | 37,705
Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,505 | 14,434 | 44,184 | 42,521
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 130 | 162 | 425 | 698
Investment management fees from pooled investment products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 114,496 | 120,310 | 337,352 | 351,927
Investment management fees from investment management agreements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 99,034 | 96,026 | 288,143 | 284,955
Investment operations fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 113,483 | 102,977 | 329,675 | 298,514
Investment processing fees - PaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,393 | 43,462 | 137,737 | 130,529
Investment processing fees - SaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31,046 | 36,807 | 94,905 | 111,433
Professional services fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,679 | 4,931 | 16,209 | 14,259
Account fees and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,796 | 11,741 | 36,314 | 35,043
Private Banks |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 114,792 | 117,250 | 335,739 | 351,601
Private Banks | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 74,633 | 76,864 | 220,254 | 229,207
Private Banks | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,234 | 24,604 | 71,938 | 75,649
Private Banks | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,596 | 10,985 | 30,723 | 32,527
Private Banks | Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,329 | 4,797 | 12,824 | 14,218
Private Banks | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Private Banks | Investment management fees from pooled investment products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,256 | 34,074 | 95,407 | 100,498
Private Banks | Investment management fees from investment management agreements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 421 | 314 | 1,060 | 1,299
Private Banks | Investment operations fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 446 | 434 | 1,359 | 1,172
Private Banks | Investment processing fees - PaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,393 | 43,462 | 137,737 | 130,529
Private Banks | Investment processing fees - SaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27,567 | 34,018 | 84,783 | 103,502
Private Banks | Professional services fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,663 | 3,533 | 11,535 | 9,896
Private Banks | Account fees and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,046 | 1,415 | 3,858 | 4,705
Investment Advisors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 103,189 | 103,033 | 299,218 | 297,916
Investment Advisors | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 103,189 | 103,033 | 299,218 | 297,916
Investment Advisors | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Investment management fees from pooled investment products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 68,287 | 72,150 | 200,718 | 208,860
Investment Advisors | Investment management fees from investment management agreements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,761 | 26,240 | 83,726 | 75,526
Investment Advisors | Investment operations fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Investment processing fees - PaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Investment processing fees - SaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Professional services fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Advisors | Account fees and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,141 | 4,643 | 14,774 | 13,530
Institutional Investors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 79,583 | 80,337 | 235,309 | 241,559
Institutional Investors | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 62,699 | 63,405 | 185,202 | 189,383
Institutional Investors | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12,930 | 12,717 | 38,034 | 39,323
Institutional Investors | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,298 | 1,743 | 4,327 | 5,178
Institutional Investors | Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,526 | 2,310 | 7,321 | 6,977
Institutional Investors | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 130 | 162 | 425 | 698
Institutional Investors | Investment management fees from pooled investment products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,417 | 13,602 | 39,628 | 41,062
Institutional Investors | Investment management fees from investment management agreements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 65,811 | 66,373 | 194,445 | 199,620
Institutional Investors | Investment operations fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Institutional Investors | Investment processing fees - PaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Institutional Investors | Investment processing fees - SaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Institutional Investors | Professional services fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Institutional Investors | Account fees and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 355 | 362 | 1,236 | 877
Investment Managers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 123,846 | 112,186 | 359,815 | 326,037
Investment Managers | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 116,196 | 104,859 | 335,776 | 304,711
Investment Managers | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Managers | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Managers | Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,650 | 7,327 | 24,039 | 21,326
Investment Managers | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Managers | Investment management fees from pooled investment products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 180 | 161 | 536 | 550
Investment Managers | Investment management fees from investment management agreements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Managers | Investment operations fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 113,037 | 102,543 | 328,316 | 297,342
Investment Managers | Investment processing fees - PaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investment Managers | Investment processing fees - SaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,479 | 2,789 | 10,122 | 7,931
Investment Managers | Professional services fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,016 | 1,398 | 4,674 | 4,363
Investment Managers | Account fees and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,134 | 5,295 | 16,167 | 15,851
Investments In New Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,517 | 3,448 | 10,254 | 9,547
Investments In New Businesses | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,517 | 3,448 | 10,254 | 9,547
Investments In New Businesses | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Investment management fees from pooled investment products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 356 | 323 | 1,063 | 957
Investments In New Businesses | Investment management fees from investment management agreements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,041 | 3,099 | 8,912 | 8,510
Investments In New Businesses | Investment operations fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Investment processing fees - PaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Investment processing fees - SaaS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Professional services fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Investments In New Businesses | Account fees and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 120 | $ 26 | $ 279 | $ 80

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