$CSGP
COSTAR GROUP, INC. Stock $csgp

$csgp Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000105735224000013 Filed on February 22, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$656.4M	$640.1M	$2.455B
YoY Change	12.33%	11.64%	12.49%
Cost Of Revenue	$141.2M	$136.3M	$491.5M
YoY Change	18.46%	24.82%	18.72%
Gross Profit	$515.2M	$503.8M	$1.964B
YoY Change	10.76%	8.54%	11.03%
Gross Profit Margin	78.49%	78.71%	79.98%
Selling, General & Admin	$464.6M	$353.8M	$1.371B
YoY Change	47.15%	32.53%	34.06%
% of Gross Profit	90.18%	70.23%	69.84%
Research & Development	$82.40M	$69.80M	$267.6M
YoY Change	23.74%	22.25%	21.13%
% of Gross Profit	15.99%	13.85%	13.63%
Depreciation & Amortization	$33.30M	$28.70M	$107.5M
YoY Change	29.94%	2.86%	-22.04%
% of Gross Profit	6.46%	5.7%	5.47%
Operating Expenses	$558.0M	$434.5M	$1.681B
YoY Change	42.0%	28.94%	27.61%
Operating Profit	-$42.80M	$69.30M	$282.3M
YoY Change	-159.26%	-45.5%	-37.4%
Interest Expense	$56.20M	$59.70M	$213.6M
YoY Change	29.05%	85.05%	564.9%
% of Operating Profit		86.15%	75.66%
Other Income/Expense, Net	-$1.900M	$3.700M	$5.400M
YoY Change	-427.02%	3233.33%	59.62%
Pretax Income	$11.50M	$132.7M	$501.3M
YoY Change	-90.12%	-16.82%	3.05%
Income Tax	$4.800M	$36.30M	$126.6M
% Of Pretax Income	41.74%	27.35%	25.25%
Net Earnings	$6.700M	$96.40M	$374.7M
YoY Change	-92.31%	-22.49%	1.42%
Net Earnings / Revenue	1.02%	15.06%	15.26%
Basic Earnings Per Share	$0.02		$0.92
Diluted Earnings Per Share	$0.02	$0.24	$0.92
COMMON SHARES
Basic Shares Outstanding	408.4M shares	408.4M shares	405.3M shares
Diluted Shares Outstanding	407.3M shares		406.9M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.952B	$5.216B	$5.216B
YoY Change	-2.06%	4.99%	4.99%
Cash & Equivalents	$4.952B	$5.200B	$5.216B
Short-Term Investments
Other Short-Term Assets	$61.40M	$70.20M	$70.20M
YoY Change	1.94%	9.77%	9.77%
Inventory
Prepaid Expenses
Receivables	$197.4M	$190.0M	$190.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$5.216B	$5.476B	$5.476B
YoY Change	-1.54%	5.6%	5.6%
LONG-TERM ASSETS
Property, Plant & Equipment	$865.9M	$472.2M	$552.0M
YoY Change	161.73%	46.99%	37.44%
Goodwill	$2.384B	$2.386B
YoY Change	2.83%	3.09%
Intangibles	$365.0M	$313.7M
YoY Change	16.83%	-4.74%
Long-Term Investments
YoY Change
Other Assets	$193.8M	$189.7M	$189.7M
YoY Change	7.84%	12.32%	12.32%
Total Long-Term Assets	$3.818B	$3.444B	$3.444B
YoY Change	18.61%	7.06%	7.06%
TOTAL ASSETS
Total Short-Term Assets	$5.216B	$5.476B	$5.476B
Total Long-Term Assets	$3.818B	$3.444B	$3.444B
Total Assets	$9.035B	$8.920B	$8.920B
YoY Change	6.08%	6.16%	6.16%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$113.6M	$23.10M	$23.10M
YoY Change	258.77%	-18.83%	-18.83%
Accrued Expenses	$326.0M	$163.0M	$320.8M
YoY Change	276.14%	82.91%	39.39%
Deferred Revenue	$117.1M	$104.2M
YoY Change	-0.59%	0.58%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$4.200M	$3.100M	$3.100M
YoY Change
Total Short-Term Liabilities	$573.8M	$455.8M	$455.8M
YoY Change	43.08%	22.32%	22.32%
LONG-TERM LIABILITIES
Long-Term Debt	$990.8M	$990.5M	$990.5M
YoY Change	0.13%	0.13%	0.13%
Other Long-Term Liabilities	$81.20M	$98.10M	$98.10M
YoY Change	-7.08%	4.01%	4.01%
Total Long-Term Liabilities	$990.8M	$990.5M	$1.089B
YoY Change	0.13%	0.13%	0.47%
TOTAL LIABILITIES
Total Short-Term Liabilities	$573.8M	$455.8M	$455.8M
Total Long-Term Liabilities	$990.8M	$990.5M	$1.089B
Total Liabilities	$1.692B	$1.581B	$1.581B
YoY Change	9.06%	3.18%	3.18%
SHAREHOLDERS EQUITY
Retained Earnings		$2.204B
YoY Change		20.48%
Common Stock		$4.100M
YoY Change		0.84%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$7.343B	$7.339B	$7.339B
YoY Change
Total Liabilities & Shareholders Equity	$9.035B	$8.920B	$8.920B
YoY Change	6.08%	6.16%	6.16%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$6.700M	$96.40M	$374.7M
YoY Change	-92.31%	-22.49%	1.42%
Depreciation, Depletion And Amortization	$33.30M	$28.70M	$107.5M
YoY Change	29.94%	2.86%	-22.04%
Cash From Operating Activities	$139.6M	$148.5M	$489.5M
YoY Change	13.3%	-19.74%	2.27%
INVESTING ACTIVITIES
Capital Expenditures	$376.7M	$66.80M	$117.5M
YoY Change	2297.38%	260.03%	234.1%
Acquisitions			$99.60M
YoY Change			1487.76%
Other Investing Activities		-$95.80M	-$95.80M
YoY Change		-468.67%	-488.04%
Cash From Investing Activities	-$380.3M	-$162.6M	-$238.6M
YoY Change	1837.34%	-2288.13%	245.52%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$0.00
YoY Change			-100.0%
Debt Paid & Issued, Net			$0.00
YoY Change			-100.0%
Cash From Financing Activities	-$22.50M	-700.0K	-$3.700M
YoY Change	41.51%	25.9%	-100.5%
NET CHANGE
Cash From Operating Activities	$139.6M	148.5M	$489.5M
Cash From Investing Activities	-$380.3M	-162.6M	-$238.6M
Cash From Financing Activities	-$22.50M	-700.0K	-$3.700M
Net Change In Cash	-$264.3M	-14.80M	$247.9M
YoY Change	-401.45%	-107.71%	-78.27%
FREE CASH FLOW
Cash From Operating Activities	$139.6M	$148.5M	$489.5M
Capital Expenditures	$376.7M	$66.80M	$117.5M
Free Cash Flow	-$237.1M	$81.70M	$372.0M
YoY Change	-320.55%	-50.92%	-16.11%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2022	csgp	Adjustments To Additional Paid In Capital Restricted Stock Surrendered AdjustmentsToAdditionalPaidInCapitalRestrictedStockSurrendered	23100000	usd
CY2023	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	17700000	usd
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	7338600000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	369500000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001057352
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#OperatingAndFinanceLeaseLiabilityCurrent
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#OperatingAndFinanceLeaseLiabilityCurrent
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#LeaseAndOtherLiabilitiesNoncurrent
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#LeaseAndOtherLiabilitiesNoncurrent
CY2022Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#OperatingAndFinanceLeaseLiabilityCurrent
CY2023Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#OperatingAndFinanceLeaseLiabilityCurrent
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#LeaseAndOtherLiabilitiesNoncurrent
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20231231#LeaseAndOtherLiabilitiesNoncurrent
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	0-24531
CY2023	dei	Entity Registrant Name EntityRegistrantName	CoStar Group, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	52-2091509
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	1331 L Street, NW
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Washington,
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	DC
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	20005
CY2023	dei	City Area Code CityAreaCode	202)
CY2023	dei	Local Phone Number LocalPhoneNumber	346-6500
CY2023	dei	Security12b Title Security12bTitle	Common Stock ($0.01 par value)
CY2023	dei	Trading Symbol TradingSymbol	CSGP
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	36000000000	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	408409321	shares
CY2023	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2023	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.95
CY2022	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.93
CY2021	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.93
CY2023	dei	Auditor Firm AuditorFirmId	42
CY2023	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.95
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	Tysons, Virginia
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	Tysons, Virginia
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2455000000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2182400000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1944100000	usd
CY2023	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	491500000	usd
CY2022	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	414000000.0	usd
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	357200000	usd
CY2023	us-gaap	Gross Profit GrossProfit	1963500000	usd
CY2022	us-gaap	Gross Profit GrossProfit	1768400000	usd
CY2021	us-gaap	Gross Profit GrossProfit	1586900000	usd
CY2023	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	989900000	usd
CY2022	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	684200000	usd
CY2021	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	622000000.0	usd
CY2023	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	267600000	usd
CY2022	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	220900000	usd
CY2021	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	201000000.0	usd
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	381500000	usd
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	338700000	usd
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	256800000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	42200000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	73600000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	74800000	usd
CY2023	us-gaap	Operating Expenses OperatingExpenses	1681200000	usd
CY2022	us-gaap	Operating Expenses OperatingExpenses	1317400000	usd
CY2021	us-gaap	Operating Expenses OperatingExpenses	1154600000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	282300000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	451000000.0	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	432300000	usd
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	213600000	usd
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	32100000	usd
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-31600000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	5400000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3400000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3300000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	501300000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	486500000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	404000000.0	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	126600000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117000000.0	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111400000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	369500000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	292600000	usd
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	406900000	shares
CY2023	us-gaap	Net Income Loss NetIncomeLoss	374700000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	369500000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	11500000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-23300000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4900000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	11500000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-23300000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4900000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	386200000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	346200000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	287700000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5215900000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4968000000	usd
CY2023Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	213200000	usd
CY2022Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	166100000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	23200000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	12200000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	190000000.0	usd
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	153900000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	70200000	usd
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	64000000.0	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	5476100000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	5185900000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	4300000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	9700000	usd
CY2023Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	472200000	usd
CY2022Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	321300000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	79800000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	80400000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	2386200000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	2314800000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	313700000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	329300000	usd
CY2023Q4	us-gaap	Deferred Costs DeferredCosts	167700000	usd
CY2022Q4	us-gaap	Deferred Costs DeferredCosts	142500000	usd
CY2023Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	17700000	usd
CY2022Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	16600000	usd
CY2023Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	2000000.0	usd
CY2022Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	2000000.0	usd
CY2023Q4	us-gaap	Assets Assets	8919700000	usd
CY2022Q4	us-gaap	Assets Assets	8402500000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	23100000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	28600000	usd
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	117800000	usd
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	105000000.0	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	163000000.0	usd
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	89100000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	7700000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	10400000	usd
CY2023Q4	csgp	Operating And Finance Lease Liability Current OperatingAndFinanceLeaseLiabilityCurrent	40000000.0	usd
CY2022Q4	csgp	Operating And Finance Lease Liability Current OperatingAndFinanceLeaseLiabilityCurrent	36000000.0	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	104200000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	103600000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	455800000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	372700000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	990500000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	989200000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	36700000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	76200000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	18200000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	14000000.0	usd
CY2023Q4	csgp	Lease And Other Liabilities Noncurrent LeaseAndOtherLiabilitiesNoncurrent	79900000	usd
CY2022Q4	csgp	Lease And Other Liabilities Noncurrent LeaseAndOtherLiabilitiesNoncurrent	80400000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	1581100000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	1532500000	usd
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1200000000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1200000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	408100000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	408100000	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	406700000	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	406700000	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	4100000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	4100000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5147800000	usd
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5065400000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-17600000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-29100000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2204300000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1829600000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	6870000000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8919700000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8402500000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	5375200000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	292600000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4900000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	6300000	usd
CY2021	csgp	Adjustments To Additional Paid In Capital Restricted Stock Surrendered AdjustmentsToAdditionalPaidInCapitalRestrictedStockSurrendered	33300000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	62600000	usd
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	13000000.0	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	5711500000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	369500000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-23300000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	74600000	usd
CY2022	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	15000000.0	usd
CY2022	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	745700000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	6870000000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	374700000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	11500000	usd
CY2023	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	7500000	usd
CY2023	csgp	Adjustments To Additional Paid In Capital Restricted Stock Surrendered AdjustmentsToAdditionalPaidInCapitalRestrictedStockSurrendered	23200000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	83600000	usd
CY2023	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	3200000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	374700000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	292600000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	107500000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	137900000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	139600000	usd
CY2023	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	95200000	usd
CY2022	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	76100000	usd
CY2021	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	63400000	usd
CY2023	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2400000	usd
CY2022	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2400000	usd
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2300000	usd
CY2023	csgp	Non Cash Lease Expense NonCashLeaseExpense	30000000.0	usd
CY2022	csgp	Non Cash Lease Expense NonCashLeaseExpense	38500000	usd
CY2021	csgp	Non Cash Lease Expense NonCashLeaseExpense	28500000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	85000000.0	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	75200000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	63700000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-37200000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-31200000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24200000	usd
CY2023	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	35000000.0	usd
CY2022	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	18300000	usd
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10900000	usd
CY2023	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-3200000	usd
CY2022	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-2400000	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	66600000	usd
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	14900000	usd
CY2022	csgp	Increase Decrease Deferred Commissions IncreaseDecreaseDeferredCommissions	-116800000	usd
CY2021	csgp	Increase Decrease Deferred Commissions IncreaseDecreaseDeferredCommissions	-72000000.0	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	33900000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	23200000	usd
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-30200000	usd
CY2023	csgp	Increase Decrease In Lease Liability IncreaseDecreaseInLeaseLiability	-39200000	usd
CY2022	csgp	Increase Decrease In Lease Liability IncreaseDecreaseInLeaseLiability	-37400000	usd
CY2021	csgp	Increase Decrease In Lease Liability IncreaseDecreaseInLeaseLiability	-30900000	usd
CY2023	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	10700000	usd
CY2022	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-19300000	usd
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	5900000	usd
CY2023	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-1300000	usd
CY2022	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	6800000	usd
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	17400000	usd
CY2023	csgp	Increase Decrease Lease Rightof Useand Other Assets IncreaseDecreaseLeaseRightofUseandOtherAssets	-1000000.0	usd
CY2022	csgp	Increase Decrease Lease Rightof Useand Other Assets IncreaseDecreaseLeaseRightofUseandOtherAssets	2200000	usd
CY2021	csgp	Increase Decrease Lease Rightof Useand Other Assets IncreaseDecreaseLeaseRightofUseandOtherAssets	-500000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	489500000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	478700000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	469700000	usd
CY2023	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	3800000	usd
CY2022	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	900000	usd
CY2021	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	0	usd
CY2023	csgp	Proceeds From Sale Of Property And Equipment And Other Assets ProceedsFromSaleOfPropertyAndEquipmentAndOtherAssets	0	usd
CY2022	csgp	Proceeds From Sale Of Property And Equipment And Other Assets ProceedsFromSaleOfPropertyAndEquipmentAndOtherAssets	30100000	usd
CY2021	csgp	Proceeds From Sale Of Property And Equipment And Other Assets ProceedsFromSaleOfPropertyAndEquipmentAndOtherAssets	600000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	117500000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	35200000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	123700000	usd
CY2023	csgp	Payments To Acquire Property And Equipment And Other Assets PaymentsToAcquirePropertyAndEquipmentAndOtherAssets	25300000	usd
CY2022	csgp	Payments To Acquire Property And Equipment And Other Assets PaymentsToAcquirePropertyAndEquipmentAndOtherAssets	58600000	usd
CY2021	csgp	Payments To Acquire Property And Equipment And Other Assets PaymentsToAcquirePropertyAndEquipmentAndOtherAssets	65200000	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	99600000	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6300000	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	193000000.0	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-238600000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-69100000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-381300000	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2200000	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	usd
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	26400000	usd
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	23000000.0	usd
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	33300000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	745700000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	usd
CY2023	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	23400000	usd
CY2022	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	13500000	usd
CY2021	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	18000000.0	usd
CY2023	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-700000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-400000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3700000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	734000000.0	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-15700000	usd
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	700000	usd
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2700000	usd
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1500000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	247900000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1140900000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	71200000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4968000000	usd
CY2023Q4	csgp	Number Of Trade Receivables In Information Services Portfolio NumberOfTradeReceivablesInInformationServicesPortfolio	4	numberofreceivable
CY2023Q4	csgp	Number Of Trade Receivables In Multifamily Portfolio NumberOfTradeReceivablesInMultifamilyPortfolio	1	numberofreceivable
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3827100000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3755900000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5215900000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4968000000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3827100000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	30700000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	29900000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	31500000	usd
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	163200000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	169200000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	82100000	usd
CY2023	csgp	Other Significant Noncash Transaction Amounts Owedfor Acquisitions OtherSignificantNoncashTransactionAmountsOwedforAcquisitions	7600000	usd
CY2022	csgp	Other Significant Noncash Transaction Amounts Owedfor Acquisitions OtherSignificantNoncashTransactionAmountsOwedforAcquisitions	0	usd
CY2021	csgp	Other Significant Noncash Transaction Amounts Owedfor Acquisitions OtherSignificantNoncashTransactionAmountsOwedforAcquisitions	100000	usd
CY2021	csgp	Capital Expenditures Incurred But Not Yet Paid And Noncash Landlord Incentives CapitalExpendituresIncurredButNotYetPaidAndNoncashLandlordIncentives	2100000	usd
CY2023	us-gaap	Nature Of Operations NatureOfOperations	<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;padding-left:28.5pt">ORGANIZATION </span><div style="margin-bottom:10pt;text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">CoStar Group (the “Company”) provides information, analytics, online marketplaces and auction services to the commercial real estate and related business community through its comprehensive, proprietary database of commercial real estate information and related tools. The Company provides online marketplaces for commercial real estate, apartment rentals, residential real estate, land for sale and businesses for sale, and its services are typically distributed to its clients under subscription-based agreements that typically renew automatically, a majority of which have a term of at least one year. The Company operates within two operating segments, North America, which includes the U.S. and Canada, and International, which primarily includes Europe, Asia-Pacific and Latin America. </span></div><div style="margin-bottom:10pt;text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company acquired Homes.com, BureauxLocaux, Business Immo, and OnTheMarket in May 2021, October 2021, April 2022 and December 2023, respectively. Through our Homes.com Acquisition and OnTheMarket Acquisition, we also offer online platforms that manage workflow and marketing for residential real estate agents and brokers and provide portals for homebuyers to view residential property listings. See Note 5 for further discussion of these acquisitions.</span></div>
CY2023	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:10pt;margin-top:10pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span></div>The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to revenue recognition, allowance for credit losses, the useful lives and recoverability of long-lived and intangible assets, goodwill, income taxes, accounting for business combinations, stock-based compensation, estimating the Company's incremental borrowing rate for its leases, and contingencies, among others. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenues and expenses. Actual results could differ from these estimates.
CY2023	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2023	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.95
CY2022	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.93
CY2021	csgp	Percentage Of Total Revenue PercentageOfTotalRevenue	0.93
CY2023	csgp	Deferred Sales Commission Amortization Period DeferredSalesCommissionAmortizationPeriod	P3Y
CY2023	csgp	Deferred Sales Commission Amortization Period DeferredSalesCommissionAmortizationPeriod	P3Y
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-17600000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-17600000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	usd
CY2023	us-gaap	Advertising Expense AdvertisingExpense	549600000	usd
CY2022	us-gaap	Advertising Expense AdvertisingExpense	305700000	usd
CY2021	us-gaap	Advertising Expense AdvertisingExpense	312000000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5200000000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5000000000	usd
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	0	usd
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	0	usd
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:10pt;margin-top:10pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Concentration of Credit Risk and Financial Instruments</span></div><div style="margin-bottom:10pt;text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company’s customer base creates a lack of dependence on any individual customer that mitigates the risk of nonpayment of the Company’s accounts receivable. No single customer accounted for more than 5% of the Company’s revenues for each of the years ended December 31, 2023, 2022 and 2021. The carrying amount of the accounts receivable approximates the net realizable value. </span></div>The Company holds cash at major financial institutions that often exceed Federal Deposit Insurance Corporation-insured limits. The Company manages its credit risk associated with cash concentrations by diversifying cash holdings across AAA rated Government and Treasury Money Market Funds and multiple high quality financial institutions, and by periodically evaluating the credit quality of the primary financial institutions holding such deposits. The carrying value of cash approximates fair value. Historically, the Company has not experienced any losses due to such cash concentrations.
CY2023Q4	csgp	Number Of Portfolio Segments NumberOfPortfolioSegments	5	portfoliosegment
CY2023Q4	csgp	Number Of Classes Of Trade Receivables Based On Location NumberOfClassesOfTradeReceivablesBasedOnLocation	2	numberofreceivable
CY2023Q4	csgp	Number Of Trade Receivables In Loop Net Portfolio NumberOfTradeReceivablesInLoopNetPortfolio	1	numberofreceivable
CY2023Q4	csgp	Number Of Trade Receivables In Other Marketplaces Portfolio Segment NumberOfTradeReceivablesInOtherMarketplacesPortfolioSegment	2	numberofreceivable
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2455000000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2182400000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1944100000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	104200000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	103600000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	100000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	200000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	104300000	usd
CY2022Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	103800000	usd
CY2022Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	103800000	usd
CY2023	csgp	Contractwith Customer Liability Prior Period Amounts Recognized ContractwithCustomerLiabilityPriorPeriodAmountsRecognized	103800000	usd
CY2023	csgp	Contractwith Customer Liability New Deferrals Netof Amounts Recognizedin Current Period ContractwithCustomerLiabilityNewDeferralsNetofAmountsRecognizedinCurrentPeriod	103400000	usd
CY2023	csgp	Contractwith Customer Asset Effectsof Currency Translation ContractwithCustomerAssetEffectsofCurrencyTranslation	900000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	104300000	usd
CY2022Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities	1800000	usd
CY2023Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities	1000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	5800000	usd
CY2022Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	4000000.0	usd
CY2023Q4	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	8000000.0	usd
CY2022Q4	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	8400000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	13800000	usd
CY2022Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	12400000	usd
CY2023	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	1400000	usd
CY2022	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	3200000	usd
CY2023	csgp	Deferred Sales Commissions Impairment DeferredSalesCommissionsImpairment	0	usd
CY2022	csgp	Deferred Sales Commissions Impairment DeferredSalesCommissionsImpairment	0	usd
CY2023	csgp	Commissions Incurred CommissionsIncurred	173500000	usd
CY2022	csgp	Commissions Incurred CommissionsIncurred	162100000	usd
CY2021	csgp	Commissions Incurred CommissionsIncurred	117300000	usd
CY2023	csgp	Commissions Capitalizedinthe Current Period CommissionsCapitalizedintheCurrentPeriod	120200000	usd
CY2022	csgp	Commissions Capitalizedinthe Current Period CommissionsCapitalizedintheCurrentPeriod	116800000	usd
CY2021	csgp	Commissions Capitalizedinthe Current Period CommissionsCapitalizedintheCurrentPeriod	72000000.0	usd
CY2023	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	95200000	usd
CY2022	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	76100000	usd
CY2021	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	63400000	usd
CY2023	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	148500000	usd
CY2022	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	121400000	usd
CY2021	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	108700000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	409600000	usd
CY2023Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P5Y
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	12200000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	35000000.0	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	24000000.0	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23200000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	13400000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	18300000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	19500000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	12200000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	15200000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	10900000	usd
CY2021	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	12700000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	13400000	usd
CY2023	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2494000000	usd
CY2022	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2224300000	usd
CY2023	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	371900000	usd
CY2022	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	361900000	usd
CY2023	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.91
CY2022	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.91
CY2023	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.91
CY2022	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.91
CY2021	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1962100000	usd
CY2021	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	286700000	usd
CY2021	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.74
CY2021	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.73
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	800000	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	200000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	usd
CY2023	csgp	Finance Lease Expense FinanceLeaseExpense	1000000.0	usd
CY2022	csgp	Finance Lease Expense FinanceLeaseExpense	0	usd
CY2021	csgp	Finance Lease Expense FinanceLeaseExpense	0	usd
CY2023	us-gaap	Lease Cost LeaseCost	36700000	usd
CY2022	us-gaap	Lease Cost LeaseCost	33600000	usd
CY2021	us-gaap	Lease Cost LeaseCost	34800000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	109900000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	118300000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7000000.0	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6200000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	102900000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	112100000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	36900000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	36000000.0	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	66000000.0	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	76100000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y10M24D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y7M6D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.036
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.031
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	79800000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	80400000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	14600000	usd
CY2022Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1600000	usd
CY2022Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	13000000.0	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3100000	usd
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	0	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	9900000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	0	usd
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y9M18D
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P0Y
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.078
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	10800000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	0	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	44900000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	41600000	usd
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	200000	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	20000000.0	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	34200000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	13600000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	577700000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	406800000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	105500000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	85500000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	472200000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	321300000	usd
CY2023	us-gaap	Depreciation Depreciation	33800000	usd
CY2022	us-gaap	Depreciation Depreciation	29100000	usd
CY2021	us-gaap	Depreciation Depreciation	29000000	usd
CY2023	csgp	Fully Depreciated Assets Write Off FullyDepreciatedAssetsWriteOff	14100000	usd
CY2022	csgp	Fully Depreciated Assets Write Off FullyDepreciatedAssetsWriteOff	27600000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	2321000000	usd
CY2022	csgp	Goodwill Acquisitions And Adjustments GoodwillAcquisitionsAndAdjustments	10500000	usd
CY2022	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-16700000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	2314800000	usd
CY2023	csgp	Goodwill Acquisitions And Adjustments GoodwillAcquisitionsAndAdjustments	62800000	usd
CY2023	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	8600000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	2386200000	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	313700000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	329300000	usd
CY2023	us-gaap	Adjustment For Amortization AdjustmentForAmortization	73700000	usd
CY2022	us-gaap	Adjustment For Amortization AdjustmentForAmortization	102600000	usd
CY2021	us-gaap	Adjustment For Amortization AdjustmentForAmortization	103600000	usd
CY2023	csgp	Indefinite Lived Intangible Assets Written Off IndefiniteLivedIntangibleAssetsWrittenOff	7400000	usd
CY2022	csgp	Indefinite Lived Intangible Assets Written Off IndefiniteLivedIntangibleAssetsWrittenOff	87700000	usd
CY2021	csgp	Indefinite Lived Intangible Assets Written Off IndefiniteLivedIntangibleAssetsWrittenOff	171000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	70800000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	54800000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	43300000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	34700000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	30800000	usd
CY2021	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
CY2022	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
CY2023	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	usd
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	700000	usd
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1300000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	163800000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	148200000	usd
CY2023Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1000000000	usd
CY2022Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1000000000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	9500000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	10800000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	990500000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	989200000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2400000	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2300000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2300000	usd
CY2023	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1600000	usd
CY2022	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	0	usd
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	0	usd
CY2023	us-gaap	Line Of Credit Facility Commitment Fee Amount LineOfCreditFacilityCommitmentFeeAmount	2600000	usd
CY2022	us-gaap	Line Of Credit Facility Commitment Fee Amount LineOfCreditFacilityCommitmentFeeAmount	2000000.0	usd
CY2021	us-gaap	Line Of Credit Facility Commitment Fee Amount LineOfCreditFacilityCommitmentFeeAmount	2000000.0	usd
CY2023	us-gaap	Interest Expense Debt InterestExpenseDebt	31400000	usd
CY2022	us-gaap	Interest Expense Debt InterestExpenseDebt	32300000	usd
CY2021	us-gaap	Interest Expense Debt InterestExpenseDebt	32300000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	126300000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	116300000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	61300000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	36600000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	31200000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	24600000	usd
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	900000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	87200000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-31700000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-20400000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	22900000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2900000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-9600000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8500000	usd
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2600000	usd
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1200000	usd
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-7200000	usd
CY2023	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-37200000	usd
CY2022	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-31200000	usd
CY2021	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	24200000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	126600000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117000000.0	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111400000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	5800000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	3400000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	11900000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	4600000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	15300000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	20400000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	34700000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	26800000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	5800000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	6700000	usd
CY2023Q4	csgp	Deferred Tax Assets Lease Liabilities DeferredTaxAssetsLeaseLiabilities	21800000	usd
CY2022Q4	csgp	Deferred Tax Assets Lease Liabilities DeferredTaxAssetsLeaseLiabilities	26400000	usd
CY2023Q4	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	92400000	usd
CY2022Q4	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	45400000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	4500000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	6100000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	192200000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	139800000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	9000000.0	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	5200000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	183200000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	134600000	usd
CY2023Q4	csgp	Deferred Tax Liabilities Accrued Commissions DeferredTaxLiabilitiesAccruedCommissions	42300000	usd
CY2022Q4	csgp	Deferred Tax Liabilities Accrued Commissions DeferredTaxLiabilitiesAccruedCommissions	36100000	usd
CY2023Q4	csgp	Deferred Tax Liabilities Lease Rightof Use Assets DeferredTaxLiabilitiesLeaseRightofUseAssets	16000000.0	usd
CY2022Q4	csgp	Deferred Tax Liabilities Lease Rightof Use Assets DeferredTaxLiabilitiesLeaseRightofUseAssets	18200000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	4100000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	3200000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	25100000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	25800000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	128100000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	117800000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	215600000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	201100000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	32400000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	66500000	usd
CY2023	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	3800000	usd
CY2022	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-500000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	526700000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	493200000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	408800000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	25400000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	6700000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	4800000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	105300000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	102100000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	84800000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	27400000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21500000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21000000.0	usd
CY2023	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1900000	usd
CY2022	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-500000	usd
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-5000000.0	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	20200000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	17500000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	13100000	usd
CY2023	csgp	Effective Income Tax Rate Reconciliation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationExcessTaxBenefitAmount	5900000	usd
CY2022	csgp	Effective Income Tax Rate Reconciliation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationExcessTaxBenefitAmount	1800000	usd
CY2021	csgp	Effective Income Tax Rate Reconciliation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationExcessTaxBenefitAmount	10900000	usd
CY2023	csgp	Effective Income Tax Rate Reconciliation Change In Tax Reserves Amount EffectiveIncomeTaxRateReconciliationChangeInTaxReservesAmount	4200000	usd
CY2022	csgp	Effective Income Tax Rate Reconciliation Change In Tax Reserves Amount EffectiveIncomeTaxRateReconciliationChangeInTaxReservesAmount	1500000	usd
CY2021	csgp	Effective Income Tax Rate Reconciliation Change In Tax Reserves Amount EffectiveIncomeTaxRateReconciliationChangeInTaxReservesAmount	-12800000	usd
CY2023	csgp	Effective Income Tax Rate Reconciliation Nondeductible Expense Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCompensationAmount	8800000	usd
CY2022	csgp	Effective Income Tax Rate Reconciliation Nondeductible Expense Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCompensationAmount	11400000	usd
CY2021	csgp	Effective Income Tax Rate Reconciliation Nondeductible Expense Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCompensationAmount	10400000	usd
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	100000	usd
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	-3900000	usd
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	34900000	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	5000000.0	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	4200000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2100000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	126600000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117000000.0	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111400000	usd
CY2023Q4	csgp	Realized Tax Benefits Related To Operating Loss Carryforward RealizedTaxBenefitsRelatedToOperatingLossCarryforward	5900000	usd
CY2022Q4	csgp	Realized Tax Benefits Related To Operating Loss Carryforward RealizedTaxBenefitsRelatedToOperatingLossCarryforward	12600000	usd
CY2021Q4	csgp	Realized Tax Benefits Related To Operating Loss Carryforward RealizedTaxBenefitsRelatedToOperatingLossCarryforward	14100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	3900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments Year One LongTermDebtMaturityInterestPaymentsYearOne	28000000.0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	25400000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	39000000.0	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28900000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3100000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5400000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	9900000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1900000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14800000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3400000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	300000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2300000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	16200000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4400000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1700000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2400000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	19900000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	19900000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16200000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4400000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1700000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2400000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	700000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	100000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	400000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1400000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	700000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	600000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	369500000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	292600000	usd
CY2023	csgp	Amortization Of Intangible Assets Costof Revenue AmortizationOfIntangibleAssetsCostofRevenue	31500000	usd
CY2022	csgp	Amortization Of Intangible Assets Costof Revenue AmortizationOfIntangibleAssetsCostofRevenue	29000000.0	usd
CY2021	csgp	Amortization Of Intangible Assets Costof Revenue AmortizationOfIntangibleAssetsCostofRevenue	28800000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	3900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments Year Two LongTermDebtMaturityInterestPaymentsYearTwo	28000000.0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	15100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	3900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments Year Three LongTermDebtMaturityInterestPaymentsYearThree	28000000.0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	13100000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments Year Four LongTermDebtMaturityInterestPaymentsYearFour	28000000.0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	10700000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments Year Five LongTermDebtMaturityInterestPaymentsYearFive	28000000.0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	6600000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1000000000	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments After Year Five LongTermDebtMaturityInterestPaymentsAfterYearFive	56000000.0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	109900000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	14600000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	1000000000	usd
CY2023Q4	csgp	Long Term Debt Maturity Interest Payments LongTermDebtMaturityInterestPayments	196000000.0	usd
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2023	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	389800000	usd
CY2022	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	582700000	usd
CY2021	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	565000000.0	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	374700000	usd
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1200000000	shares
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	csgp	Dividends Common Stock Shares DividendsCommonStockShares	9	shares
CY2023	csgp	Amortization Of Intangible Assets Net Of Adjustments AmortizationOfIntangibleAssetsNetOfAdjustments	42200000	usd
CY2022	csgp	Amortization Of Intangible Assets Net Of Adjustments AmortizationOfIntangibleAssetsNetOfAdjustments	73600000	usd
CY2021	csgp	Amortization Of Intangible Assets Net Of Adjustments AmortizationOfIntangibleAssetsNetOfAdjustments	74800000	usd
CY2023	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	33800000	usd
CY2022	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	29100000	usd
CY2021	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	29100000	usd
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	213600000	usd
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	32100000	usd
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-31600000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	5400000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3400000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3300000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	126600000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117000000.0	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111400000	usd
CY2023	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	389800000	usd
CY2022	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	582700000	usd
CY2021	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	565000000.0	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	472200000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	321300000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	2386200000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	2314800000	usd
CY2023Q4	us-gaap	Assets Assets	8919700000	usd
CY2022Q4	us-gaap	Assets Assets	8402500000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	1581100000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	1532500000	usd
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023	us-gaap	Net Income Loss NetIncomeLoss	374700000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	405300000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	396300000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	392200000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1600000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1500000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000.0	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	406900000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	397800000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	394200000	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.92
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.93
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.92
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.93
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	700000	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000	shares
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6800000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2400000	usd
CY2023Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	1899660	shares
CY2023	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P5Y6M10D
CY2023Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	49.69
CY2023Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	1571105	shares
CY2023Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	44.32
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2022	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2022	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2023	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2021	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	25500000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	21500000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	17600000	usd
CY2023	us-gaap	Defined Contribution Plan Administrative Expenses DefinedContributionPlanAdministrativeExpenses	0	usd
CY2021	us-gaap	Defined Contribution Plan Administrative Expenses DefinedContributionPlanAdministrativeExpenses	0	usd
CY2022	us-gaap	Defined Contribution Plan Administrative Expenses DefinedContributionPlanAdministrativeExpenses	0	usd
CY2023Q4	csgp	Percentage Of Purchase Price Of Companys Common Stock To Market Price PercentageOfPurchasePriceOfCompanysCommonStockToMarketPrice	0.90
CY2021Q2	csgp	Increase In Shares Of Common Stock Issued Pursuant To Stock Plan IncreaseInSharesOfCommonStockIssuedPursuantToStockPlan	1000000	shares
CY2023Q4	csgp	Shares Available Employee Stock Purchase Plan SharesAvailableEmployeeStockPurchasePlan	782328	shares
CY2022Q4	csgp	Shares Available Employee Stock Purchase Plan SharesAvailableEmployeeStockPurchasePlan	1010267	shares
CY2023	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	227939	shares
CY2022	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	223596	shares

Files In Submission

Name	View Source	Status
0001057352-24-000013-index-headers.html	Edgar Link	pending
0001057352-24-000013-index.html	Edgar Link	pending
0001057352-24-000013.txt	Edgar Link	pending
0001057352-24-000013-xbrl.zip	Edgar Link	pending
csgp-20231231.htm	Edgar Link	pending
csgp-20231231.xsd	Edgar Link	pending
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$CSGP
COSTAR GROUP, INC. Stock $csgp

2024 Q1 Form 10-K Financial Statement

#000105735224000013 Filed on February 22, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP COSTAR GROUP, INC. Stock $csgp

2024 Q1 Form 10-K Financial Statement

#000105735224000013 Filed on February 22, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP
COSTAR GROUP, INC. Stock $csgp