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Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2021 | Nov. 23, 2020 | Oct. 26, 2020 | Oct. 01, 2020 | Feb. 28, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price, net of cash |  |  |  |  |  | $ 14,314 | $ 885,323 |  |
Goodwill |  | $ 2,861 |  |  |  | $ 6,198,701 |  | $ 6,252,636 | $ 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 |  |  |  |  | 47,467 |  |  |  |
Non-current portion of deferred revenue |  |  |  |  | 936 |  |  |  |
Operating lease liabilities |  |  |  |  | 20,341 |  |  |  |
Total liabilities |  |  |  |  | 201,093 |  |  |  |
Fair value of acquired identifiable assets and liabilities |  |  |  |  | 446,957 |  |  |  |
Goodwill |  |  |  |  | 497,263 |  |  |  |
Cash acquired |  |  |  |  | 20,777 |  |  |  |
Decision Resources Group | Software Development |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Other intangible assets |  |  |  |  | 3,966 |  |  |  |
CPA Global |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | $ 380,259 |  |  |  |  |
Prepaid expenses |  |  |  | 27,437 |  |  |  |  |
Other current assets |  |  |  | 215,734 |  |  |  |  |
Property and equipment, net |  |  |  | 13,290 |  |  |  |  |
Other intangible assets |  |  |  | 4,920,317 |  |  |  |  |
Deferred income taxes |  |  |  | 21,027 |  |  |  |  |
Other non-current assets |  |  |  | 25,736 |  |  |  |  |
Operating lease right-of-use assets |  |  |  | 30,649 |  |  |  |  |
Total assets |  |  |  | 5,634,449 |  |  |  |  |
Accounts payable |  |  |  | 53,791 |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  | 458,551 |  |  |  |  |
Current portion of deferred revenue |  |  |  | 181,365 |  |  |  |  |
Current portion of operating lease liabilities |  |  |  | 7,738 |  |  |  |  |
Deferred income taxes |  |  |  | 288,541 |  |  |  |  |
Non-current portion of deferred revenue |  |  |  | 16,771 |  |  |  |  |
Other non-current liabilities |  |  |  | 43,785 |  |  |  |  |
Operating lease liabilities |  |  |  | 23,615 |  |  |  |  |
Total liabilities |  |  |  | 1,074,157 |  |  |  |  |
Fair value of acquired identifiable assets and liabilities |  |  |  | 4,560,292 |  |  |  |  |
Business Combination, Consideration Transferred, Net of Cash Acquired |  |  |  | 8,740,324 |  |  |  |  |
Goodwill |  |  |  | 4,180,032 |  |  |  |  |
Cash acquired |  |  |  | $ 99,275 |  |  |  |  |
IncoPat |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  | $ 1,107 |  |  |  |  |  |
Prepaid expenses |  |  | 168 |  |  |  |  |  |
Other current assets |  |  | 100 |  |  |  |  |  |
Property and equipment, net |  |  | 354 |  |  |  |  |  |
Other intangible assets |  |  | 21,957 |  |  |  |  |  |
Other non-current assets |  |  | 283 |  |  |  |  |  |
Total assets |  |  | 23,969 |  |  |  |  |  |
Accounts payable |  |  | 73 |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  | 843 |  |  |  |  |  |
Current portion of deferred revenue |  |  | 6,445 |  |  |  |  |  |
Deferred income taxes |  |  | 4,802 |  |  |  |  |  |
Other non-current liabilities |  |  | 283 |  |  |  |  |  |
Total liabilities |  |  | 12,446 |  |  |  |  |  |
Fair value of acquired identifiable assets and liabilities |  |  | 11,523 |  |  |  |  |  |
Purchase price, net of cash |  |  | 52,133 |  |  |  |  |  |
Goodwill |  |  | 40,610 |  |  |  |  |  |
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 |  | 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 |  |  |  |  |  |  |
DRG |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Net of Cash Acquired |  |  |  |  | $ 944,220 |  |  |  |
BioInfogate |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable | $ 366 |  |  |  |  |  |  |  |
Prepaid expenses | 3 |  |  |  |  |  |  |  |
Other current assets | 102 |  |  |  |  |  |  |  |
Property and equipment, net | 21 |  |  |  |  |  |  |  |
Other intangible assets | 6,280 |  |  |  |  |  |  |  |
Deferred income taxes | 184 |  |  |  |  |  |  |  |
Other non-current assets | 6 |  |  |  |  |  |  |  |
Total assets | 6,962 |  |  |  |  |  |  |  |
Accounts payable | 12 |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities | 82 |  |  |  |  |  |  |  |
Current portion of deferred revenue | 1,247 |  |  |  |  |  |  |  |
Total liabilities | 1,341 |  |  |  |  |  |  |  |
Fair value of acquired identifiable assets and liabilities | 5,621 |  |  |  |  |  |  |  |
Purchase price, net of cash | 16,918 |  |  |  |  |  |  |  |
Goodwill | 11,297 |  |  |  |  |  |  |  |
Cash acquired | $ 2,069 |  |  |  |  |  |  |  |

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