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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended |
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Dec. 31, 2020 USD ($) subsidiary shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting Policies |  |  |  |
Recurring revenue percentage of total revenue (percent) | 73.00% |  |  |
Cash and investments | $ 758,500,000 |  |  |
Revolving line of credit | $ 0 | $ 0 |  |
Number of wholly-owned subsidiaries | subsidiary | 11 |  |  |
Accounts receivable, net | $ 403,700,000 | 396,500,000 |  |
Accounts receivable, allowance for losses | $ 9,255,000 | 5,738,000 |  |
Sales commission, renewal period | 1 year |  |  |
Research and development expense | $ 88,363,000 | 81,342,000 | $ 63,264,000 |
Goodwill impairment loss | 0 |  |  |
Impairments of intangible assets | 0 | 0 | 0 |
Impairments of long-lived assets | 0 | 0 | 0 |
Capitalized post acquisition software development costs | $ 5,800,000 | 4,800,000 |  |
Remaining estimated economic life | 5 years |  |  |
Amortization of software development costs | $ 1,200,000 | 300,000 |  |
Purchase of held to maturity securities | 154,800,000 |  |  |
Interest receivable | 896,000 |  |  |
Cost-method investment impairment | 0 | 0 | 0 |
Cash and cash equivalents | 603,623,000 | 232,682,000 | $ 134,279,000 | $ 185,926,000
Data And Insight |  |  |  |
Accounting Policies |  |  |  |
Goodwill assessed for impairment | 75,700,000 |  |  |
Case Management, Business Process Management, Data And Insight |  |  |  |
Accounting Policies |  |  |  |
Goodwill assessed for impairment | $ 152,000,000.0 |  |  |
Percentage of total goodwill | 18.00% |  |  |
BFTR, LLC |  |  |  |
Accounting Policies |  |  |  |
Cost method investment | $ 10,000,000.0 |  |  |
Investment percentage | 18.00% |  |  |
Convertible Preferred Stock | Record Holdings Pty Limited |  |  |  |
Accounting Policies |  |  |  |
Cost method investment | $ 15,000,000.0 |  |  |
Investment percentage | 20.00% |  |  |
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 |  |  |
Vesting 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 | 20.00% |  |  |
Payment term | 90 days |  |  |
Sales commissions amortization period (in years) | 7 years |  |  |
Vesting period (in years) | 6 years |  |  |
Stock Option Plan |  |  |  |
Accounting Policies |  |  |  |
Contractual term (in years) | 10 years |  |  |
Stock Option Plan | Minimum |  |  |  |
Accounting Policies |  |  |  |
Vesting period (in years) | 3 years |  |  |
Stock Option Plan | Maximum |  |  |  |
Accounting Policies |  |  |  |
Vesting period (in years) | 6 years |  |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |
Accounting Policies |  |  |  |
Vesting period (in years) | 3 years |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |
Accounting Policies |  |  |  |
Vesting period (in years) | 5 years |  |  |
Performance Shares |  |  |  |
Accounting Policies |  |  |  |
Share conversion rate (shares) | shares | 1 |  |  |
Unbilled Revenues |  |  |  |
Accounting Policies |  |  |  |
Accounts receivable, net | $ 140,800,000 | 134,000,000.0 |  |
Unbilled Revenues | Retention Receivable |  |  |  |
Accounting Policies |  |  |  |
Accounts receivable, net | $ 13,100,000 | $ 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 | Minimum |  |  |  |
Accounting Policies |  |  |  |
Contract term (in years) | 1 year |  |  |
Appraisal services | Maximum |  |  |  |
Accounting Policies |  |  |  |
Contract term (in years) | 3 years |  |  |
Revolving Credit Facility | Credit Agreement |  |  |  |
Accounting Policies |  |  |  |
Revolving line of credit | $ 0 |  |  |
Line of credit facility, unused borrowing capacity | $ 400,000,000 |  |  |

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