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Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 23, 2020 | Oct. 26, 2020 | Oct. 01, 2020 | Feb. 28, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, net of cash |  |  |  |  | $ (433) | $ 885,323 |  |
Goodwill | $ 2,861 |  |  |  | $ 6,036,515 |  | $ 6,042,964 | $ 1,328,045
Decision Resources Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | $ 52,193 |  |  |  |
Prepaid expenses |  |  |  | 4,295 |  |  |  |
Other current assets |  |  |  | 68,001 |  |  |  |
Property and equipment, net |  |  |  | 4,136 |  |  |  |
Other intangible assets |  |  |  | 491,366 |  |  |  |
Other non-current assets |  |  |  | 2,960 |  |  |  |
Operating lease right-of-use assets |  |  |  | 25,099 |  |  |  |
Total assets |  |  |  | 648,050 |  |  |  |
Accounts payable |  |  |  | 3,474 |  |  |  |
Accrued expenses and other current liabilities |  |  |  | 88,561 |  |  |  |
Current portion of deferred revenue |  |  |  | 35,126 |  |  |  |
Current portion of operating lease liabilities |  |  |  | 5,188 |  |  |  |
Deferred income taxes(3) |  |  |  | (49,403) |  |  |  |
Non-current portion of deferred revenue |  |  |  | 936 |  |  |  |
Operating lease liabilities |  |  |  | 20,341 |  |  |  |
Total liabilities |  |  |  | 203,029 |  |  |  |
Fair value of acquired identifiable assets and liabilities |  |  |  | 445,021 |  |  |  |
Business Combination, Consideration Transferred, Net of Cash Acquired |  |  |  | 944,220 |  |  |  |
Goodwill |  |  |  | 499,199 |  |  |  |
Cash acquired |  |  |  | 20,777 |  |  |  |
Decision Resources Group | Revision Of Prior Period Error Correction Adjustment Amd No 2 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Deferred income taxes(3) |  |  |  | (1,936) |  |  |  |
Decision Resources Group | Software Development |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other intangible assets |  |  |  | $ 3,966 |  |  |  |
CPA Global |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  | $ 379,346 |  |  |  |  |
Prepaid expenses |  |  | 27,595 |  |  |  |  |
Other current assets |  |  | 38,414 |  |  |  |  |
Property and equipment, net |  |  | 12,288 |  |  |  |  |
Other intangible assets |  |  | 4,920,317 |  |  |  |  |
Deferred income taxes |  |  | 19,310 |  |  |  |  |
Other non-current assets |  |  | 7,280 |  |  |  |  |
Operating lease right-of-use assets |  |  | 30,649 |  |  |  |  |
Total assets |  |  | 5,435,199 |  |  |  |  |
Accounts payable |  |  | 53,501 |  |  |  |  |
Accrued expenses and other current liabilities |  |  | 234,119 |  |  |  |  |
Current portion of deferred revenue |  |  | 179,619 |  |  |  |  |
Current portion of operating lease liabilities |  |  | 7,738 |  |  |  |  |
Deferred income taxes(3) |  |  | (305,635) |  |  |  |  |
Non-current portion of deferred revenue |  |  | 16,786 |  |  |  |  |
Other non-current liabilities |  |  | 24,307 |  |  |  |  |
Operating lease liabilities |  |  | 23,615 |  |  |  |  |
Total liabilities |  |  | 845,320 |  |  |  |  |
Fair value of acquired identifiable assets and liabilities |  |  | 4,589,879 |  |  |  |  |
Business Combination, Consideration Transferred, Net of Cash Acquired |  |  | 8,541,118 |  |  |  |  |
Goodwill |  |  | 3,951,239 |  |  |  |  |
Restricted cash |  |  | 3,400 |  |  |  |  |
Cash acquired |  |  | 102,443 |  |  |  |  |
CPA Global | Revision Of Prior Period Error Correction Adjustment Amd No 2 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Deferred income taxes(3) |  |  | 3,328 |  |  |  |  |
Other non-current liabilities |  |  | $ 19,478 |  |  |  |  |
IncoPat |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  | $ 1,132 |  |  |  |  |  |
Prepaid expenses |  | 168 |  |  |  |  |  |
Other current assets |  | 100 |  |  |  |  |  |
Property and equipment, net |  | 354 |  |  |  |  |  |
Other intangible assets |  | 21,957 |  |  |  |  |  |
Other non-current assets |  | 283 |  |  |  |  |  |
Total assets |  | 23,994 |  |  |  |  |  |
Accounts payable |  | 73 |  |  |  |  |  |
Accrued expenses and other current liabilities |  | 843 |  |  |  |  |  |
Current portion of deferred revenue |  | 6,334 |  |  |  |  |  |
Deferred income taxes(3) |  | (4,802) |  |  |  |  |  |
Other non-current liabilities |  | 283 |  |  |  |  |  |
Total liabilities |  | 12,335 |  |  |  |  |  |
Fair value of acquired identifiable assets and liabilities |  | 11,659 |  |  |  |  |  |
Purchase price, net of cash |  | 52,133 |  |  |  |  |  |
Goodwill |  | 40,474 |  |  |  |  |  |
Cash acquired |  | $ 844 |  |  |  |  |  |
Hanlim IPS |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable | 44 |  |  |  |  |  |  |
Prepaid expenses | 7 |  |  |  |  |  |  |
Other current assets | 844 |  |  |  |  |  |  |
Property and equipment, net | 75 |  |  |  |  |  |  |
Other intangible assets | 8,805 |  |  |  |  |  |  |
Other non-current assets | 94 |  |  |  |  |  |  |
Total assets | 9,869 |  |  |  |  |  |  |
Accounts payable | 27 |  |  |  |  |  |  |
Accrued expenses and other current liabilities | 1,512 |  |  |  |  |  |  |
Deferred income taxes(3) | (1,937) |  |  |  |  |  |  |
Total liabilities | 3,476 |  |  |  |  |  |  |
Fair value of acquired identifiable assets and liabilities | 6,393 |  |  |  |  |  |  |
Purchase price, net of cash | 9,254 |  |  |  |  |  |  |
Cash acquired | $ 2,191 |  |  |  |  |  |  |

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