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EMPLOYEE BENEFIT PLANS (Stock Incentive Plans - Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 09, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 52,255 | $ 42,718 | $ 39,030 |
Performance service period | 3 years |  |  |
CoStar Group, Inc. 2007 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future grant under the plan (in shares) |  |  |  | 0
Shares of common stock authorized for issuance under the plan (in shares) | 815,464 |  |  |
CoStar Group, Inc. 2007 Stock Incentive Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of options and restricted stock grants | 3 years |  |  |
CoStar Group, Inc. 2007 Stock Incentive Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of options and restricted stock grants | 4 years |  |  |
CoStar Group, Inc. 2016 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future grant under the plan (in shares) | 2,000,000 |  |  |
Shares of common stock authorized for issuance under the plan (in shares) | 1,450,000 |  |  |
CoStar Group, Inc. 2016 Stock Incentive Plan | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of options and restricted stock grants | 3 years |  |  |
CoStar Group, Inc. 2016 Stock Incentive Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of options and restricted stock grants | 4 years |  |  |
Management Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average-period expected to recognize the unrecognized compensation cost (in years) | 4 years |  |  |
Restricted Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of options and restricted stock grants | 1 year |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost expected to be recognized in future years | $ 82,000 |  |  |
Weighted-average-period expected to recognize the unrecognized compensation cost (in years) | 2 years 6 months |  |  |
Exercise of stock options (in shares) | 116,918 | 177,299 | 81,815 |
Aggregate intrinsic value of options exercised | $ 40,000 | $ 45,000 | $ 13,000 |
Weighted-average grant date fair value of each option granted during the period (in dollars per share) | $ 115.17 | $ 101.02 | $ 59.06 |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted (in shares) |  | 26,160 | 32,160 |
Performance Shares | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement, award vesting rights, percentage | 80.00% |  |  |
Performance Shares | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement, award vesting rights, percentage | 120.00% |  |  |
Performance-based RSAs - with Market Condition |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost expected to be recognized in future years | $ 11,000 |  |  |
Compensation expense | $ 8,000 | $ 5,000 | $ 5,000 |
Performance Based RSAs Without Market Condition |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 115,722 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 413 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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