$CSGP
COSTAR GROUP, INC. Stock $csgp

$csgp Overview Financials Valuation SEC Filings Company Website

2013 Q4 Form 10-Q Financial Statement

#000105735213000078 Filed on October 24, 2013

Income Statement

Concept	2013 Q4	2013 Q3	2012 Q3
Revenue	$115.6M	$112.3M	$96.00M
YoY Change	15.48%	16.98%	50.4%
Cost Of Revenue	$31.80M	$31.72M	$30.88M
YoY Change	0.95%	2.73%	45.84%
Gross Profit	$83.90M	$80.58M	$65.12M
YoY Change	22.3%	23.74%	52.67%
Gross Profit Margin	72.58%	71.75%	67.83%
Selling, General & Admin	$47.10M	$45.57M	$41.63M
YoY Change	6.8%	9.46%	22.08%
% of Gross Profit	56.14%	56.55%	63.92%
Research & Development	$11.60M	$11.56M	$9.722M
YoY Change	16.0%	18.93%	93.78%
% of Gross Profit	13.83%	14.35%	14.93%
Depreciation & Amortization	$9.800M	$3.388M	$2.844M
YoY Change	-7.55%	19.13%	33.58%
% of Gross Profit	11.68%	4.2%	4.37%
Operating Expenses	$62.10M	$60.81M	$56.17M
YoY Change	5.79%	8.25%	41.67%
Operating Profit	$21.80M	$19.77M	$8.946M
YoY Change	120.2%	120.99%	197.8%
Interest Expense	-$600.0K	$1.736M	$1.822M
YoY Change	-700.0%	-4.72%	811.0%
% of Operating Profit	-2.75%	8.78%	20.37%
Other Income/Expense, Net	-$1.000M	-$1.000M	-$1.100M
YoY Change	-44.44%	-9.09%
Pretax Income	$20.10M	$29.79M	$19.64M
YoY Change	145.12%	51.68%	226.97%
Income Tax	$7.300M	$7.034M	$404.0K
% Of Pretax Income	36.32%	23.61%	2.06%
Net Earnings	$12.80M	$11.05M	$6.779M
YoY Change	172.34%	63.03%	193.34%
Net Earnings / Revenue	11.07%	9.84%	7.06%
Basic Earnings Per Share		$0.40	$0.25
Diluted Earnings Per Share	$450.7K	$0.39	$0.24
COMMON SHARES
Basic Shares Outstanding	28.76M shares	27.76M shares	27.24M shares
Diluted Shares Outstanding		28.35M shares	27.67M shares

Balance Sheet

Concept	2013 Q4	2013 Q3	2012 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$256.0M	$222.9M	$130.3M
YoY Change	64.0%	71.07%	-76.49%
Cash & Equivalents	$256.0M	$222.9M	$129.5M
Short-Term Investments		$0.00	$800.0K
Other Short-Term Assets	$31.80M	$29.90M	$26.10M
YoY Change	45.87%	14.56%	70.59%
Inventory
Prepaid Expenses
Receivables	$20.76M	$22.96M	$21.40M
Other Receivables	$0.00	$1.800M	$6.600M
Total Short-Term Assets	$308.5M	$277.6M	$184.3M
YoY Change	54.57%	50.58%	-68.73%
LONG-TERM ASSETS
Property, Plant & Equipment	$57.72M	$55.70M	$42.96M
YoY Change	24.64%	29.66%	16.74%
Goodwill	$718.6M	$718.0M	$718.1M
YoY Change	0.07%	-0.01%
Intangibles	$144.5M	$150.8M	$178.2M
YoY Change	-15.33%	-15.38%
Long-Term Investments	$22.00M	$21.70M	$21.60M
YoY Change	1.38%	0.46%	-23.94%
Other Assets	$5.700M	$6.600M	$9.500M
YoY Change	-35.96%	-30.53%	-31.65%
Total Long-Term Assets	$948.5M	$952.8M	$970.3M
YoY Change	-1.77%	-1.81%	453.21%
TOTAL ASSETS
Total Short-Term Assets	$308.5M	$277.6M	$184.3M
Total Long-Term Assets	$948.5M	$952.8M	$970.3M
Total Assets	$1.257B	$1.230B	$1.155B
YoY Change	7.88%	6.56%	50.98%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$4.939M	$6.347M	$3.718M
YoY Change	-20.77%	70.71%	-15.5%
Accrued Expenses	$23.20M	$23.50M	$19.61M
YoY Change	22.09%	19.84%	-36.13%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$24.06M	$21.88M	$13.13M
YoY Change	37.5%	66.67%
Total Short-Term Liabilities	$111.6M	$107.4M	$93.03M
YoY Change	9.76%	15.45%	44.01%
LONG-TERM LIABILITIES
Long-Term Debt	$129.1M	$135.6M	$157.5M
YoY Change	-15.71%	-13.89%
Other Long-Term Liabilities	$0.00	$0.00	$977.0K
YoY Change	-100.0%	-100.0%	-98.07%
Total Long-Term Liabilities	$129.1M	$135.6M	$158.5M
YoY Change	-16.28%	-14.42%	213.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$111.6M	$107.4M	$93.03M
Total Long-Term Liabilities	$129.1M	$135.6M	$158.5M
Total Liabilities	$329.1M	$331.1M	$338.8M
YoY Change	-2.86%	-2.29%	194.36%
SHAREHOLDERS EQUITY
Retained Earnings	$69.32M
YoY Change	75.1%
Common Stock	$288.0K
YoY Change	1.77%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$927.9M	$899.3M	$815.9M
YoY Change
Total Liabilities & Shareholders Equity	$1.257B	$1.230B	$1.155B
YoY Change	7.88%	6.56%	50.98%

Cashflow Statement

Concept	2013 Q4	2013 Q3	2012 Q3
OPERATING ACTIVITIES
Net Income	$12.80M	$11.05M	$6.779M
YoY Change	172.34%	63.03%	193.34%
Depreciation, Depletion And Amortization	$9.800M	$3.388M	$2.844M
YoY Change	-7.55%	19.13%	33.58%
Cash From Operating Activities	$35.50M	$31.20M	$26.00M
YoY Change	20.34%	20.0%	490.91%
INVESTING ACTIVITIES
Capital Expenditures	-$3.700M	-$6.400M	-$2.900M
YoY Change	-36.21%	120.69%	26.09%
Acquisitions
YoY Change
Other Investing Activities	$0.00	$0.00	$4.200M
YoY Change	-100.0%	-100.0%	600.0%
Cash From Investing Activities	-$3.800M	-$6.400M	$1.300M
YoY Change	-25.49%	-592.31%	-176.47%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	1.200M	7.800M	-1.200M
YoY Change	-40.0%	-750.0%	-340.0%
NET CHANGE
Cash From Operating Activities	35.50M	31.20M	26.00M
Cash From Investing Activities	-3.800M	-6.400M	1.300M
Cash From Financing Activities	1.200M	7.800M	-1.200M
Net Change In Cash	32.90M	32.60M	26.10M
YoY Change	24.62%	24.9%	715.63%
FREE CASH FLOW
Cash From Operating Activities	$35.50M	$31.20M	$26.00M
Capital Expenditures	-$3.700M	-$6.400M	-$2.900M
Free Cash Flow	$39.20M	$37.60M	$28.90M
YoY Change	11.05%	30.1%	331.34%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	174000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8667000	USD
CY2013Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	6347000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	6234000	USD
CY2013Q3	us-gaap	Accounts Payable Related Parties Current And Noncurrent AccountsPayableRelatedPartiesCurrentAndNoncurrent	-73004000	USD
CY2012Q4	us-gaap	Accounts Payable Related Parties Current And Noncurrent AccountsPayableRelatedPartiesCurrentAndNoncurrent	-67167000	USD
CY2013Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	22960000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	16392000	USD
CY2012Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	-73399000	USD
CY2013Q3	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	-79024000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	248000	USD
CY2012Q3	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	113000	USD
CY2013Q3	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	62000	USD
CY2012	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	293000	USD
CY2012Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	2818000	USD
CY2013Q3	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	2915000	USD
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	19002000	USD
CY2013Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	23498000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1842000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1905000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-4613000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-4593000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6518000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6435000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	21063000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	14996000	USD
CY2013Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7788000	USD
CY2012Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3739000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	32270000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2935000	USD
CY2013Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3646000	USD
CY2012Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	763000	USD
	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	0	USD
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
	us-gaap	Net Income Loss NetIncomeLoss	5201000	USD
	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	143000	USD
	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	143000	USD
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2012	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	0	USD
CY2013Q3	us-gaap	Assets Assets	1230374000	USD
CY2013Q3	us-gaap	Assets Current AssetsCurrent	277570000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	199563000	USD
CY2013Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	23517000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	23604000	USD
CY2013Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	760000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1235000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2273000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2273000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1235000	USD
CY2012Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4824000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11699000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9038000	USD
CY2013Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3680000	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2013Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012Q4	us-gaap	Assets Assets	1165139000	USD
CY2013Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	21069000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	21156000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	0	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	606000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	21069000	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2013Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	21675000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	21699000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2013Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2012Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2013Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2013Q3	us-gaap	Availableforsale Securities Failed Auction Value AvailableforsaleSecuritiesFailedAuctionValue	24300000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	156027000	USD
CY2013Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	222938000	USD
CY2012Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	129462000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	545280000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	66911000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-415818000	USD
CY2013Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	12704000	USD
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8520000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	7159000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17018000	USD
CY2013Q3	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	2954000	USD
	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	5607000	USD
CY2012Q3	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	3027000	USD
	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	9007000	USD
	us-gaap	Cost Of Revenue CostOfRevenue	83388000	USD
CY2012Q3	us-gaap	Cost Of Revenue CostOfRevenue	30882000	USD
	us-gaap	Cost Of Revenue CostOfRevenue	97431000	USD
CY2013Q3	us-gaap	Cost Of Revenue CostOfRevenue	31724000	USD
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	11500000	USD
CY2013Q3	us-gaap	Deferred Costs DeferredCosts	4543000	USD
CY2012Q4	us-gaap	Deferred Costs DeferredCosts	6622000	USD
CY2013Q3	us-gaap	Deferred Costs Current DeferredCostsCurrent	2740000	USD
CY2012Q4	us-gaap	Deferred Costs Current DeferredCostsCurrent	2934000	USD
CY2013Q3	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	2523000	USD
CY2012Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	2523000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-6448000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	11828000	USD
CY2012Q4	us-gaap	Deferred Rent Credit Noncurrent DeferredRentCreditNoncurrent	17305000	USD
CY2013Q3	us-gaap	Deferred Rent Credit Noncurrent DeferredRentCreditNoncurrent	22713000	USD
CY2012Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	32548000	USD
CY2013Q3	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	34904000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	9256000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	17115000	USD
	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	15405000	USD
CY2012Q3	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	-57000	USD
	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	-57000	USD
CY2013Q3	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	5655000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	35482000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	34071000	USD
CY2013Q3	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	2044000	USD
CY2012Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	2274000	USD
	us-gaap	Depreciation Depreciation	7203000	USD
	us-gaap	Depreciation Depreciation	9174000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7554000	USD
CY2012Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2844000	USD
CY2013Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3388000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9531000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	63000	USD
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	108000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.38
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.65
CY2012Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	23831000	USD
CY2013Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	18256000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	15405000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-57000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	-57000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	15405000	USD
	us-gaap	Fair Value Inputs Discount Rate FairValueInputsDiscountRate	0.052
CY2012	us-gaap	Fair Value Inputs Discount Rate FairValueInputsDiscountRate	0.051
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	735000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	735000	USD
CY2013Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	63000	USD
CY2013Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	50000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	4150000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	4200000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	21561000	USD
CY2013Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	21675000	USD
CY2013Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	21675000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	24976000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	21662000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	24584000	USD
CY2013Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	0	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	0	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	1344000	USD
CY2013Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	1208000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2185000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2304000	USD
CY2013Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	1146000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2072000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	170632000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	150800000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	59602000	USD
CY2013Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21940000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	74457000	USD
CY2012Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	19617000	USD
CY2013Q3	us-gaap	Goodwill Goodwill	718039000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	718078000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	91784000	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	625174000	USD
	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	-39000	USD
CY2012	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	1120000	USD
CY2013Q3	us-gaap	Gross Profit GrossProfit	80577000	USD
	us-gaap	Gross Profit GrossProfit	166465000	USD
CY2012Q3	us-gaap	Gross Profit GrossProfit	65119000	USD
	us-gaap	Gross Profit GrossProfit	227902000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29792000	USD
CY2013Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7034000	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	404000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10510000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5357000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	62692000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	39734000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	19641000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	27445000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7183000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18086000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	14953000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9752000	USD
CY2013Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	1796000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	4222000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	17413000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	8305000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3612000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	5905000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	2352000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1286000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	220000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	533000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1848000	USD
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	412000	shares
CY2012Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	430000	shares
CY2013Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	591000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	530000	shares
CY2013Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	150800000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	170632000	USD
	us-gaap	Interest Expense InterestExpense	3022000	USD
	us-gaap	Interest Expense InterestExpense	5249000	USD
CY2013Q3	us-gaap	Interest Expense InterestExpense	1736000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	1822000	USD
	us-gaap	Interest Paid InterestPaid	3339000	USD
CY2013Q3	us-gaap	Interest Paid InterestPaid	1307000	USD
CY2012Q3	us-gaap	Interest Paid InterestPaid	1059000	USD
	us-gaap	Interest Paid InterestPaid	1787000	USD
CY2013Q3	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	-18344000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	338796000	USD
CY2013Q3	us-gaap	Liabilities Liabilities	331055000	USD
CY2013Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	52000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	239000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	440000	USD
CY2013Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1230374000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1165139000	USD
CY2013Q3	us-gaap	Liabilities Current LiabilitiesCurrent	107403000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	101638000	USD
CY2013Q3	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2012Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	59000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	-18344000	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	17500000	USD
CY2013Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	21875000	USD
CY2013Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	135625000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	153125000	USD
CY2012Q4	us-gaap	Long Term Investments LongTermInvestments	21662000	USD
CY2013Q3	us-gaap	Long Term Investments LongTermInvestments	21675000	USD
CY2011Q2	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	200000	USD
CY2011Q2	us-gaap	Loss Contingency New Claims Filed Number LossContingencyNewClaimsFiledNumber	3	class_action_lawsuits
	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">ORGANIZATION</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">CoStar Group, Inc. (the “Company” or “CoStar”) provides information, analytics and marketing services to the commercial real estate and related business community through its comprehensive, proprietary database of commercial real estate information covering the United States (“U.S.”) and parts of the United Kingdom ("U.K.") and France, as well as its complementary online marketplace of commercial real estate listings. The Company operates within </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">two</font><font style="font-family:inherit;font-size:10pt;"> operating segments, U.S. and International, and its services are typically distributed to its clients under subscription-based license agreements that renew automatically, a majority of which have a term of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">one year</font><font style="font-family:inherit;font-size:10pt;">.</font></div></div>
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	9219000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	162872000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-635311000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-15244000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	72828000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	56558000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	11052000	USD
	us-gaap	Operating Expenses OperatingExpenses	148930000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	8946000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	32455000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	17535000	USD
	us-gaap	Net Income Loss NetIncomeLoss	16935000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	6779000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segments
CY2012Q3	us-gaap	Operating Expenses OperatingExpenses	56173000	USD
CY2013Q3	us-gaap	Operating Expenses OperatingExpenses	60807000	USD
	us-gaap	Operating Expenses OperatingExpenses	195447000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	19770000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1652000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	20000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1014000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1286000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1652000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1741000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1958000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	83000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	727000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	63000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	672000	USD
CY2013Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2013Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	0	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1030000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	11546000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7563000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3817000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	640929000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	9002000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	15331000	USD
CY2013Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	10021000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	9560000	USD
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications </font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain previously reported amounts in the condensed consolidated statements of operations and condensed consolidated statements of cash flows have been reclassified to conform to the Company’s current presentation.</font></div></div>
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	175000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1344000	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	87000	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	14620000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	46308000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	55703000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1819000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1418000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	13125000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4375000	USD
CY2013Q3	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	11562000	USD
	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	35152000	USD
CY2012Q3	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	9722000	USD
	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	22714000	USD
CY2013Q3	us-gaap	Revenues Revenues	112301000	USD
CY2012Q3	us-gaap	Revenues Revenues	96001000	USD
	us-gaap	Revenues Revenues	325333000	USD
	us-gaap	Revenues Revenues	249853000	USD
CY2012Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	22010000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	57576000	USD
CY2013Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	23625000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	74139000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	8667000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	32270000	USD
CY2013Q3	us-gaap	Short Term Investments ShortTermInvestments	0	USD
CY2012Q4	us-gaap	Short Term Investments ShortTermInvestments	37000	USD
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	224382	shares
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	340599	shares
CY2013Q3	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	150560	shares
CY2012Q3	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	76542	shares
CY2013Q3	us-gaap	Stockholders Equity StockholdersEquity	899319000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	826343000	USD
CY2012Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	9556000	USD
CY2013Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	7283000	USD
	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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. Actual results could differ from those estimates.</font></div></div>
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27673000	shares
CY2013Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	28349000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	28137000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26691000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26279000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27607000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27243000	shares
CY2013Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27758000	shares
CY2013Q3	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	48000	USD
CY2012Q3	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	48000	USD
CY2012Q3	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	0	USD
CY2013Q3	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	0	USD
	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	442000	USD
	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	0	USD
	csgp	Auction Rate Securities Variable Rate Debt Instruments Interest Rate Reset Period AuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateResetPeriod	P28D
	csgp	Debt Issuance Legal Fees DebtIssuanceLegalFees	2300000	USD
	csgp	Debt Issuance Underwriting Fees DebtIssuanceUnderwritingFees	9200000	USD
CY2012Q1	csgp	Default Interest Rate Spread Per Annum DefaultInterestRateSpreadPerAnnum	0.02
CY2012Q4	csgp	Deferred Gain On Sale Of Building Noncurrent DeferredGainOnSaleOfBuildingNoncurrent	28809000	USD
CY2013Q3	csgp	Deferred Gain On Sale Of Building Noncurrent DeferredGainOnSaleOfBuildingNoncurrent	26917000	USD
CY2012Q1	csgp	Excess Cash Flow Payment Maturity Period Within Issuance Of Financial Statements ExcessCashFlowPaymentMaturityPeriodWithinIssuanceOfFinancialStatements	P10D
CY2013Q3	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	0	USD
	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	2011000	USD
CY2012Q3	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	0	USD
	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	0	USD
CY2012	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	2011000	USD
CY2012Q1	csgp	First Excess Cash Flow Repayment Percentage FirstExcessCashFlowRepaymentPercentage	0.5
CY2013Q3	csgp	Gross Unrealized Gainsfor Available For Sale Securities GrossUnrealizedGainsforAvailableForSaleSecurities	164000	USD
CY2012Q4	csgp	Gross Unrealized Gainsfor Available For Sale Securities GrossUnrealizedGainsforAvailableForSaleSecurities	101000	USD
CY2013Q3	csgp	Gross Unrealized Lossesfor Available For Sale Securities GrossUnrealizedLossesforAvailableForSaleSecurities	2006000	USD
CY2012Q4	csgp	Gross Unrealized Lossesfor Available For Sale Securities GrossUnrealizedLossesforAvailableForSaleSecurities	2006000	USD
CY2012Q4	csgp	Intangible Asset Net Book Value IntangibleAssetNetBookValue	302000	USD
CY2013Q3	csgp	Intangible Asset Net Book Value IntangibleAssetNetBookValue	159000	USD
CY2012Q1	csgp	Libor Maturity Period LiborMaturityPeriod	P1M
CY2012Q1	csgp	Maximum Debt Service Coverage Ratio MaximumDebtServiceCoverageRatio	1.5
CY2012Q1	csgp	Maximum Total Leverage Ratio After Eight Fiscal Quarters MaximumTotalLeverageRatioAfterEightFiscalQuarters	2.50
CY2012Q1	csgp	Maximum Total Leverage Ratio For Fifth Through Eighth Quarters After Closing Date MaximumTotalLeverageRatioForFifthThroughEighthQuartersAfterClosingDate	2.75
	csgp	Minimum Contractual Maturities On Underlying Securities Involved In Auction Rate Securities MinimumContractualMaturitiesOnUnderlyingSecuritiesInvolvedInAuctionRateSecurities	P20Y
CY2013Q3	csgp	Minimum Number Of Current Litigation Matters MinimumNumberOfCurrentLitigationMatters	1	current_litigation_matters
	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	7667000	USD
	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	15846000	USD
CY2013Q3	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	6935000	USD
CY2012Q3	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	2635000	USD
CY2012Q1	csgp	Second Excess Cash Flow Repayment Percentage SecondExcessCashFlowRepaymentPercentage	0.25
CY2013Q3	csgp	Segment Reporting Segment Gross Assets SegmentReportingSegmentGrossAssets	1327742000	USD
CY2012Q4	csgp	Segment Reporting Segment Gross Assets SegmentReportingSegmentGrossAssets	1256882000	USD
	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2012Q2	csgp	Term Of Consent Order Public Comment Period TermOfConsentOrderPublicCommentPeriod	P30D
CY2012Q1	csgp	Third Excess Cash Flow Repayment Percentage ThirdExcessCashFlowRepaymentPercentage	0
CY2012Q4	csgp	Total Segment Liabilities TotalSegmentLiabilities	405963000	USD
CY2013Q3	csgp	Total Segment Liabilities TotalSegmentLiabilities	404059000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Period End Date DocumentPeriodEndDate	2013-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001057352
CY2013Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	28756248	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	COSTAR GROUP INC

Files In Submission

Name	View Source	Status
0001057352-13-000078-index-headers.html	Edgar Link	pending
0001057352-13-000078-index.html	Edgar Link	pending
0001057352-13-000078.txt	Edgar Link	pending
0001057352-13-000078-xbrl.zip	Edgar Link	pending
csgp-20130930.xml	Edgar Link	completed
csgp-20130930.xsd	Edgar Link	pending
csgp-20130930_cal.xml	Edgar Link	unprocessable
csgp-20130930_def.xml	Edgar Link	unprocessable
csgp-20130930_lab.xml	Edgar Link	unprocessable
csgp-20130930_pre.xml	Edgar Link	unprocessable
csgp-9302013x10q.htm	Edgar Link	pending
csgp-9302013xex101.htm	Edgar Link	pending
csgp-9302013xex311.htm	Edgar Link	pending
csgp-9302013xex312.htm	Edgar Link	pending
csgp-9302013xex321.htm	Edgar Link	pending
csgp-9302013xex322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
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R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
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R22.htm	Edgar Link	pending
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R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
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R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CSGP
COSTAR GROUP, INC. Stock $csgp

2013 Q4 Form 10-Q Financial Statement

#000105735213000078 Filed on October 24, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP COSTAR GROUP, INC. Stock $csgp

2013 Q4 Form 10-Q Financial Statement

#000105735213000078 Filed on October 24, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP
COSTAR GROUP, INC. Stock $csgp