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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) subsidiary | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 09, 2021 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies |  |  |  |  |
Total revenues | $ 1,592,287,000 | $ 1,116,663,000 | $ 1,086,427,000 |  |
Recurring revenue percentage of total revenue (percent) | 79.00% |  |  |  |
Cash and investments | $ 407,800,000 |  |  |  |
Number of wholly-owned subsidiaries | subsidiary | 60 |  |  |  |
Accounts receivable, net | $ 535,000,000 | 403,700,000 |  |  |
Accounts receivable, allowance for losses | $ 12,086,000 | 9,255,000 | 5,738,000 |  |
Sales commission, renewal period | 1 year |  |  |  |
Research and development expense | $ 93,481,000 | 88,363,000 | 81,342,000 |  |
Impairments of intangible assets | 0 | 0 | 0 |  |
Impairments of long-lived assets | 0 | 0 | 0 |  |
Capitalized post acquisition software development costs | 21,700,000 | 5,800,000 |  |  |
Amortization of software development costs | 2,300,000 | 1,200,000 | 296,000 |  |
Cash and cash equivalents | 309,171,000 | 603,623,000 | 232,682,000 |  | $ 134,279,000
Goodwill | $ 2,359,674,000 | 838,428,000 | 840,117,000 |  |
Software and Software Development Costs |  |  |  |  |
Accounting Policies |  |  |  |  |
Remaining estimated economic life | 5 years |  |  |  |
Case Management, Business Process Management, Data And Insight |  |  |  |  |
Accounting Policies |  |  |  |  |
Percentage of total goodwill | 68.00% |  |  |  |
Goodwill | $ 1,600,000,000 |  |  |  |
Minimum |  |  |  |  |
Accounting Policies |  |  |  |  |
Typical contract term (in years) | 3 years |  |  |  |
Contract term (in years) | 1 year |  |  |  |
Progress billing retention percentage | 5.00% |  |  |  |
Payment term | 30 days |  |  |  |
Sales commissions amortization period (in years) | 3 years |  |  |  |
Maximum |  |  |  |  |
Accounting Policies |  |  |  |  |
Typical contract term (in years) | 5 years |  |  |  |
Contract term (in years) | 10 years |  |  |  |
Progress billing retention percentage | 15.00% |  |  |  |
Payment term | 90 days |  |  |  |
Sales commissions amortization period (in years) | 7 years |  |  |  |
Stock Option Plan |  |  |  |  |
Accounting Policies |  |  |  |  |
Share based compensation contractual term (in years) | 10 years |  |  |  |
Stock Option Plan | Minimum |  |  |  |  |
Accounting Policies |  |  |  |  |
Share based compensation vesting period (in years) | 3 years |  |  |  |
Stock Option Plan | Maximum |  |  |  |  |
Accounting Policies |  |  |  |  |
Share based compensation vesting period (in years) | 6 years |  |  |  |
Unbilled Revenues |  |  |  |  |
Accounting Policies |  |  |  |  |
Accounts receivable, net | $ 140,300,000 | 140,800,000 |  |  |
Unbilled Revenues | Retention Receivable |  |  |  |  |
Accounting Policies |  |  |  |  |
Accounts receivable, net | $ 7,700,000 | 13,100,000 |  |  |
SaaS arrangements services | Minimum |  |  |  |  |
Accounting Policies |  |  |  |  |
Typical contract term (in years) | 3 years |  |  |  |
Contract term (in years) | 1 year |  |  |  |
SaaS arrangements services | Maximum |  |  |  |  |
Accounting Policies |  |  |  |  |
Typical contract term (in years) | 5 years |  |  |  |
Contract term (in years) | 10 years |  |  |  |
Appraisal services |  |  |  |  |
Accounting Policies |  |  |  |  |
Total revenues | $ 27,788,000 | $ 21,127,000 | $ 23,479,000 |  |
Appraisal services | Minimum |  |  |  |  |
Accounting Policies |  |  |  |  |
Contract term (in years) | 1 year |  |  |  |
Appraisal services | Maximum |  |  |  |  |
Accounting Policies |  |  |  |  |
Contract term (in years) | 3 years |  |  |  |
Software Licenses Royalties and Software Services | Tour Health |  |  |  |  |
Accounting Policies |  |  |  |  |
Total revenues | $ 75,000,000 |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes |  |  |  |  |
Accounting Policies |  |  |  |  |
Debt instrument face amount | 600,000,000 |  |  | $ 600,000,000 |
Revolving Credit Facility | 2021 Credit Agreement |  |  |  |  |
Accounting Policies |  |  |  |  |
Debt instrument face amount | 755,000,000 |  |  |  |
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility |  |  |  |  |
Accounting Policies |  |  |  |  |
Line of credit facility, unused borrowing capacity | $ 500,000,000 |  |  |  |

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