$CSGP
COSTAR GROUP, INC. Stock $csgp

$csgp Overview Financials Valuation SEC Filings Company Website

2012 Q2 Form 10-Q Financial Statement

#000105735212000117 Filed on July 26, 2012

Income Statement

Concept	2012 Q2	2011 Q2
Revenue	$85.22M	$62.13M
YoY Change	37.18%	11.34%
Cost Of Revenue	$28.17M	$22.41M
YoY Change	25.7%	9.86%
Gross Profit	$57.05M	$39.72M
YoY Change	43.65%	11.87%
Gross Profit Margin	66.94%	63.93%
Selling, General & Admin	$45.51M	$30.13M
YoY Change	51.06%	14.54%
% of Gross Profit	79.77%	75.85%
Research & Development	$7.977M	$5.135M
YoY Change	55.35%	25.24%
% of Gross Profit	13.98%	12.93%
Depreciation & Amortization	$2.446M	$2.354M
YoY Change	3.91%	-30.76%
% of Gross Profit	4.29%	5.93%
Operating Expenses	$57.06M	$35.81M
YoY Change	59.37%	15.88%
Operating Profit	-$13.00K	$3.909M
YoY Change	-100.33%	-15.02%
Interest Expense	$1.200M	$200.0K
YoY Change	500.0%	0.0%
% of Operating Profit		5.12%
Other Income/Expense, Net	-$700.0K
YoY Change
Pretax Income	$8.171M	$7.117M
YoY Change	14.81%	51.43%
Income Tax	$5.628M	$1.450M
% Of Pretax Income	68.88%	20.37%
Net Earnings	-$6.710M	$2.637M
YoY Change	-354.46%	-20.09%
Net Earnings / Revenue	-7.87%	4.24%
Basic Earnings Per Share	-$0.25	$0.12
Diluted Earnings Per Share	-$0.25	$0.12
COMMON SHARES
Basic Shares Outstanding	26.47M shares	22.01M shares
Diluted Shares Outstanding	26.47M shares	22.43M shares

Balance Sheet

Concept	2012 Q2	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$104.2M	$551.2M
YoY Change	-81.1%	174.78%
Cash & Equivalents	$103.3M	$547.6M
Short-Term Investments	$800.0K	$3.600M
Other Short-Term Assets	$30.20M	$13.20M
YoY Change	128.79%	59.04%
Inventory
Prepaid Expenses
Receivables	$19.52M	$13.30M
Other Receivables	$5.800M	$900.0K
Total Short-Term Assets	$159.6M	$578.6M
YoY Change	-72.41%	163.72%
LONG-TERM ASSETS
Property, Plant & Equipment	$43.23M	$37.10M
YoY Change	16.51%	-39.28%
Goodwill	$717.2M
YoY Change
Intangibles	$186.0M
YoY Change
Long-Term Investments	$25.00M	$29.00M
YoY Change	-13.79%	-1.36%
Other Assets	$10.30M	$15.20M
YoY Change	-32.24%	149.18%
Total Long-Term Assets	$981.7M	$179.3M
YoY Change	447.51%	-8.57%
TOTAL ASSETS
Total Short-Term Assets	$159.6M	$578.6M
Total Long-Term Assets	$981.7M	$179.3M
Total Assets	$1.141B	$757.9M
YoY Change	50.59%	82.41%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$6.307M	$4.100M
YoY Change	53.83%	24.24%
Accrued Expenses	$18.78M	$28.90M
YoY Change	-35.01%	4.33%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$10.94M
YoY Change
Total Short-Term Liabilities	$85.26M	$60.20M
YoY Change	41.63%	31.15%
LONG-TERM LIABILITIES
Long-Term Debt	$161.9M	$0.00
YoY Change
Other Long-Term Liabilities	$926.0K	$51.80M
YoY Change	-98.21%	2626.32%
Total Long-Term Liabilities	$162.8M	$51.80M
YoY Change	214.29%	2626.32%
TOTAL LIABILITIES
Total Short-Term Liabilities	$85.26M	$60.20M
Total Long-Term Liabilities	$162.8M	$51.80M
Total Liabilities	$338.7M	$112.0M
YoY Change	202.41%	134.31%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$802.6M	$645.9M
YoY Change
Total Liabilities & Shareholders Equity	$1.141B	$757.9M
YoY Change	50.59%	82.41%

Cashflow Statement

Concept	2012 Q2	2011 Q2
OPERATING ACTIVITIES
Net Income	-$6.710M	$2.637M
YoY Change	-354.46%	-20.09%
Depreciation, Depletion And Amortization	$2.446M	$2.354M
YoY Change	3.91%	-30.76%
Cash From Operating Activities	$24.20M	$7.600M
YoY Change	218.42%	-46.1%
INVESTING ACTIVITIES
Capital Expenditures	-$3.100M	-$4.100M
YoY Change	-24.39%	51.85%
Acquisitions
YoY Change
Other Investing Activities	-$631.7M	$200.0K
YoY Change	-315950.0%	-96.87%
Cash From Investing Activities	-$634.8M	-$3.900M
YoY Change	16176.92%	-200.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$247.9M
YoY Change		61875.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	164.9M	251.6M
YoY Change	-34.46%	125700.0%
NET CHANGE
Cash From Operating Activities	24.20M	7.600M
Cash From Investing Activities	-634.8M	-3.900M
Cash From Financing Activities	164.9M	251.6M
Net Change In Cash	-445.7M	255.3M
YoY Change	-274.58%	1302.75%
FREE CASH FLOW
Cash From Operating Activities	$24.20M	$7.600M
Capital Expenditures	-$3.100M	-$4.100M
Free Cash Flow	$27.30M	$11.70M
YoY Change	133.33%	-30.36%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q2	us-gaap	Accounts Payable Current AccountsPayableCurrent	6307000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	6010000	USD
CY2011Q4	us-gaap	Accounts Payable Related Parties Current And Noncurrent AccountsPayableRelatedPartiesCurrentAndNoncurrent	-49139000	USD
CY2012Q2	us-gaap	Accounts Payable Related Parties Current And Noncurrent AccountsPayableRelatedPartiesCurrentAndNoncurrent	-56896000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	61000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	994000	USD
	csgp	Debt Issuance Underwriting Fees DebtIssuanceUnderwritingFees	9200000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	175000	USD
CY2012Q2	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	-64971000	USD
CY2012Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	19523000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	16589000	USD
CY2011Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	-57612000	USD
CY2011Q2	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	32000	USD
CY2012Q2	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	61000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	64000	USD
CY2011	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	85000	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	978000	USD
CY2012Q2	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2011Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	2151000	USD
CY2012Q2	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	2855000	USD
CY2012Q2	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	18781000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	12761000	USD
CY2012Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2700000	USD
CY2012Q2	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-5618000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-5890000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-8568000	USD
CY2012Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-8351000	USD
	us-gaap	Acquired Finite Lived Intangible Asset Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife	10	Y
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	2199000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	7032000	USD
CY2012Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2741000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4928000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4265000	USD
CY2011Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2201000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2524000	USD
CY2012Q2	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3273000	USD
CY2011Q2	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	0	USD
CY2012Q2	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	472000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	0	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	472000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	0	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	472000	USD
CY2011Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	546000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1089000	USD
CY2012Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3580000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4214000	USD
CY2012Q2	us-gaap	Assets Assets	1141287000	USD
CY2011Q4	us-gaap	Assets Assets	771035000	USD
CY2012Q2	us-gaap	Assets Current AssetsCurrent	159609000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	583183000	USD
CY2012Q2	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	28529000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	30777000	USD
CY2012Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	24579000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	24638000	USD
CY2012Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	45000	USD
CY2012Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	442000	USD
CY2012Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	24534000	USD
CY2012Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	775000	USD
CY2012Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	25796000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	28099000	USD
CY2012Q2	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	2742000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	2742000	USD
CY2012Q2	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	9000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	64000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	545280000	USD
CY2012Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	103338000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	206405000	USD
CY2011Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	547617000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-441942000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	341212000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1361000	USD
CY2012Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-7389000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8163000	USD
CY2011Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2606000	USD
	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	2580000	USD
CY2012Q2	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	2158000	USD
CY2011Q2	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	308000	USD
	us-gaap	Cost Of Goods Sold Amortization CostOfGoodsSoldAmortization	615000	USD
CY2011Q2	us-gaap	Cost Of Revenue CostOfRevenue	22412000	USD
	us-gaap	Cost Of Revenue CostOfRevenue	52506000	USD
	us-gaap	Cost Of Revenue CostOfRevenue	44978000	USD
CY2012Q2	us-gaap	Cost Of Revenue CostOfRevenue	28172000	USD
CY2012Q2	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	11500000	USD
CY2012Q2	us-gaap	Deferred Costs DeferredCosts	8095000	USD
CY2011Q4	us-gaap	Deferred Costs DeferredCosts	918000	USD
CY2011Q4	us-gaap	Deferred Costs Current DeferredCostsCurrent	0	USD
CY2012Q2	us-gaap	Deferred Costs Current DeferredCostsCurrent	2978000	USD
CY2012Q2	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	2523000	USD
CY2011Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	2523000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8530000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14458000	USD
CY2011Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	22271000	USD
CY2011Q4	us-gaap	Deferred Rent Credit Current DeferredRentCreditCurrent	544000	USD
CY2012Q2	us-gaap	Deferred Rent Credit Current DeferredRentCreditCurrent	533000	USD
CY2012Q2	us-gaap	Deferred Rent Credit Noncurrent DeferredRentCreditNoncurrent	16368000	USD
CY2011Q4	us-gaap	Deferred Rent Credit Noncurrent DeferredRentCreditNoncurrent	16592000	USD
CY2012Q2	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	28610000	USD
CY2012Q2	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	19487000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	11227000	USD
CY2012Q2	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	0	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	10224000	USD
CY2012Q2	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	41339000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	0	USD
CY2011Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	2241000	USD
CY2012Q2	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	2178000	USD
	us-gaap	Depreciation Depreciation	4441000	USD
	us-gaap	Depreciation Depreciation	4472000	USD
CY2012Q2	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2446000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4710000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4936000	USD
CY2011Q2	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2354000	USD
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.25
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.06
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.25
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.06
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-1000	USD
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	95000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.37
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	1.20
CY2012Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	17569000	USD
CY2011Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	16695000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1247000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	1247000	USD
CY2009	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	684000	USD
CY2008	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	-3710000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	245000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	40000	USD
CY2011Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	100000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	50000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	0	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	50000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	4850000	USD
CY2008	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	20925000	USD
CY2009	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	300000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	575000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	24584000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	29189000	USD
CY2011Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	29014000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	24976000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	24534000	USD
CY2011Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	29114000	USD
CY2009Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	29724000	USD
CY2007Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	53975000	USD
CY2008Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	29340000	USD
	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	500000	USD
CY2011Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	500000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	0	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	2100000	USD
CY2011Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2786000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2072000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	3222000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0	USD
CY2011Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	3254000	USD
	us-gaap	Finite Lived Intangible Assets Amortization Method FiniteLivedIntangibleAssetsAmortizationMethod	125% declining balance method
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	20530000	USD
CY2012Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	185992000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1082000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7770000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	11385000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	20093000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	17645000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	8171000	USD
CY2012Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	25491000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	39985000	USD
CY2011Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	15845000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	26744000	USD
CY2012Q2	us-gaap	Goodwill Goodwill	717212000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	91784000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	79602000	USD
CY2011	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	12205000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	625174000	USD
	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	254000	USD
CY2011	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	-23000	USD
CY2012Q2	us-gaap	Gross Profit GrossProfit	57051000	USD
	us-gaap	Gross Profit GrossProfit	101346000	USD
	us-gaap	Gross Profit GrossProfit	76767000	USD
CY2011Q2	us-gaap	Gross Profit GrossProfit	39715000	USD
CY2011Q3	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	500000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	7117000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	61782000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	4087000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5628000	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1450000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4216000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9348000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	850000	USD
CY2012Q2	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5727000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	2679000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-3716000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1084000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1329000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	458000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	1968000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	377000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1236000	USD
	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	9218000	USD
	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	9472000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-148000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1630000	USD
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	20530000	USD
CY2012Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	185992000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	-819000	USD
CY2011Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	178000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	380000	USD
CY2012Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	-1069000	USD
CY2012Q2	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	-18344000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	-18344000	USD
CY2012Q2	us-gaap	Liabilities Liabilities	338695000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	111858000	USD
CY2012Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1141287000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	771035000	USD
CY2012Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	70000000	USD
CY2012Q2	us-gaap	Liabilities Current LiabilitiesCurrent	85261000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-17000	USD
CY2012Q2	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2012Q2	us-gaap	Long Term Debt LongTermDebt	172813000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2012Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	10938000	USD
CY2012Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	10938000	USD
CY2012Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	43750000	USD
CY2012Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	28437000	USD
CY2012Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	19688000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	0	USD
CY2012Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	161875000	USD
CY2012Q2	us-gaap	Long Term Investments LongTermInvestments	24976000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	24584000	USD
CY2011Q2	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	200000	USD
CY2012Q2	us-gaap	Loss Contingency Pending Claims Number LossContingencyPendingClaimsNumber	1	current_litigation_matters
	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, analytic 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 one year.</font></div></div>
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	251934000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	164059000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	73899000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-636578000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	30578000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15284000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-1578000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	2637000	USD
	us-gaap	Net Income Loss NetIncomeLoss	7169000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	-6710000	USD
	us-gaap	Operating Expenses OperatingExpenses	92757000	USD
CY2012Q2	us-gaap	Operating Expenses OperatingExpenses	57064000	USD
CY2011Q2	us-gaap	Operating Expenses OperatingExpenses	35806000	USD
	us-gaap	Operating Expenses OperatingExpenses	65762000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-13000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	8589000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	11005000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	3909000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	272000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-662000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-27000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-54000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	11546000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-4000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	1048000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	217000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-679000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-31000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-55000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2012Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	926000	USD
CY2011	us-gaap	Payments For Rent PaymentsForRent	-1319000	USD
CY2012Q2	us-gaap	Payments For Rent PaymentsForRent	-280000	USD
CY2012Q1	us-gaap	Payments For Rent PaymentsForRent	-344000	USD
CY2011Q2	us-gaap	Payments For Underwriting Expense PaymentsForUnderwritingExpense	10400000	USD
CY2011Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	500000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2240000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1777000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	640929000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	9887000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	6117000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	5722000	USD
CY2012Q2	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	7736000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	247924000	USD
CY2011Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	247900000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	175000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	10468000	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	233000	USD
CY2012Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	43225000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	37571000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	865000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	975000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2187000	USD
CY2011Q2	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	5135000	USD
	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	10403000	USD
CY2012Q2	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	7977000	USD
	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	12992000	USD
CY2011Q3	us-gaap	Restructuring Charges RestructuringCharges	1500000	USD
CY2011Q4	us-gaap	Restructuring Reserve RestructuringReserve	833000	USD
CY2012Q1	us-gaap	Restructuring Reserve RestructuringReserve	543000	USD
CY2010Q4	us-gaap	Restructuring Reserve RestructuringReserve	931000	USD
CY2012Q2	us-gaap	Restructuring Reserve RestructuringReserve	302000	USD
	us-gaap	Restructuring Reserve Accrual Adjustment RestructuringReserveAccrualAdjustment	78000	USD
	us-gaap	Restructuring Reserve Accrual Adjustment RestructuringReserveAccrualAdjustment	60000	USD
	us-gaap	Revenues Revenues	153852000	USD
CY2012Q2	us-gaap	Revenues Revenues	85223000	USD
CY2011Q2	us-gaap	Revenues Revenues	62127000	USD
	us-gaap	Revenues Revenues	121745000	USD
	us-gaap	Sale Leaseback Transaction Net Proceeds SaleLeasebackTransactionNetProceeds	0	USD
	us-gaap	Sale Leaseback Transaction Net Proceeds SaleLeasebackTransactionNetProceeds	83553000	USD
CY2012Q2	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	140273	shares
CY2012Q2	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	20016000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	27526000	USD
CY2011Q2	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	14280000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	35566000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4265000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4928000	USD
CY2011Q4	us-gaap	Short Term Investments ShortTermInvestments	3515000	USD
CY2012Q2	us-gaap	Short Term Investments ShortTermInvestments	820000	USD
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	122473	shares
CY2011Q2	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	90975	shares
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	147840	shares
CY2012Q2	us-gaap	Stockholders Equity StockholdersEquity	802592000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	659177000	USD
	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	1247000	USD
CY2012Q2	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	-465000	USD
	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	0	USD
CY2011Q2	us-gaap	Tax Benefit From Stock Options Exercised TaxBenefitFromStockOptionsExercised	652000	USD
CY2011Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	900000	USD
CY2012Q2	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	11100000	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>
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	25797000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	22426000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26465000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	21695000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	21271000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	22011000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26465000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25797000	shares
CY2012Q2	csgp	Accumulated Other Comprehensive Income Loss Investment Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossInvestmentSecuritiesAdjustmentNetOfTax	-2733000	USD
CY2011Q4	csgp	Accumulated Other Comprehensive Income Loss Investment Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossInvestmentSecuritiesAdjustmentNetOfTax	-2678000	USD
CY2012Q2	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	48000	USD
CY2011Q2	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	0	USD
	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	0	USD
	csgp	Amortization Expense Capitalized Product Development Costs AmortizationExpenseCapitalizedProductDevelopmentCosts	95000	USD
	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	0	USD
CY2012Q2	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	442000	USD
	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	442000	USD
CY2011Q2	csgp	Auction Rate Securities Upon Acquisition AuctionRateSecuritiesUponAcquisition	0	USD
CY2012Q2	csgp	Auction Rate Securities Variable Rate Debt Instruments Interest Rate Reset Period In Days AuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateResetPeriodInDays	reset approximately every 28 days
	csgp	Auction Rate Securities Variable Rate Debt Instruments Interest Rate Reset Period In Days AuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateResetPeriodInDays	reset approximately every 28 days
CY2011Q3	csgp	Business Acquisition Contingent Consideration Cash Payment BusinessAcquisitionContingentConsiderationCashPayment	1600000	USD
CY2011Q2	csgp	Business Acquisition Contingent Consideration Cash Payment BusinessAcquisitionContingentConsiderationCashPayment	500000	USD
CY2011Q3	csgp	Business Acquisition Deferred Consideration Liability Reversal BusinessAcquisitionDeferredConsiderationLiabilityReversal	1200000	USD
CY2011Q2	csgp	Common Stock Issued In Equity Offering In Period CommonStockIssuedInEquityOfferingInPeriod	4312500	shares
	csgp	Debt Issuance Legal Fees DebtIssuanceLegalFees	2300000	USD
CY2012Q1	csgp	Default Interest Rate Spread Per Annum DefaultInterestRateSpreadPerAnnum	0.02
CY2012Q2	csgp	Deferred Gain On Sale Of Building Noncurrent DeferredGainOnSaleOfBuildingNoncurrent	30071000	USD
CY2011Q4	csgp	Deferred Gain On Sale Of Building Noncurrent DeferredGainOnSaleOfBuildingNoncurrent	31333000	USD
CY2012Q1	csgp	Excess Cash Flow Payment Maturity Period Within Issuance Of Financial Statements ExcessCashFlowPaymentMaturityPeriodWithinIssuanceOfFinancialStatements	P10D
	csgp	Fair Value Inputs Discount Rate FairValueInputsDiscountRate	0.054
	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	0	USD
	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	2011000	USD
CY2011Q2	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	0	USD
CY2012Q2	csgp	Fair Value Liabilities Deferred Consideration Upon Acquisition FairValueLiabilitiesDeferredConsiderationUponAcquisition	2011000	USD
CY2012Q1	csgp	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Adjustments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdjustments	0	USD
CY2011	csgp	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Adjustments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdjustments	1207000	USD
CY2012Q1	csgp	First Excess Cash Flow Repayment Percentage FirstExcessCashFlowRepaymentPercentage	0.5
CY2012Q2	csgp	Intangible Asset Net Book Value IntangibleAssetNetBookValue	398000	USD
CY2011Q4	csgp	Intangible Asset Net Book Value IntangibleAssetNetBookValue	493000	USD
CY2011Q2	csgp	Liabilities Deferred Consideration Fair Value Disclosuredeferred Consideration LiabilitiesDeferredConsiderationFairValueDisclosuredeferredConsideration	2786000	USD
CY2012Q1	csgp	Libor Maturity Period LiborMaturityPeriod	P1M
CY2012Q1	csgp	Maximum Debt Service Coverage Ratio For Two Quarters After Closing MaximumDebtServiceCoverageRatioForTwoQuartersAfterClosing	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
CY2012Q1	csgp	Maximum Total Leverage Ratio For Third And Fourth Quarters After Closing Date MaximumTotalLeverageRatioForThirdAndFourthQuartersAfterClosingDate	3
CY2012Q1	csgp	Maximum Total Leverage Ratio For Two Quarters After Closing MaximumTotalLeverageRatioForTwoQuartersAfterClosing	3.25
CY2012Q2	csgp	Minimum Contractual Maturities On Underlying Securities Involved In Auction Rate Securities In Years MinimumContractualMaturitiesOnUnderlyingSecuritiesInvolvedInAuctionRateSecuritiesInYears	greater than twenty years
	csgp	Minimum Contractual Maturities On Underlying Securities Involved In Auction Rate Securities In Years MinimumContractualMaturitiesOnUnderlyingSecuritiesInvolvedInAuctionRateSecuritiesInYears	greater than twenty years
CY2012Q2	csgp	Number Of Business Segments NumberOfBusinessSegments	2	operating_segments
CY2011Q2	csgp	Number Of Class Action Lawsuits Brought By Alleged Loopnet Stockholders NumberOfClassActionLawsuitsBroughtByAllegedLoopnetStockholders	3	class_action_lawsuits
CY2012Q2	csgp	Number Of Days For Auction Rate Securities Variable Rate Debt Instruments Interest Rate Reset NumberOfDaysForAuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateReset	28
CY2011Q1	csgp	Number Of Days For Auction Rate Securities Variable Rate Debt Instruments Interest Rate Reset NumberOfDaysForAuctionRateSecuritiesVariableRateDebtInstrumentsInterestRateReset	28
CY2012Q2	csgp	Number Of Distinct Intangible Asset NumberOfDistinctIntangibleAsset	1	distinct_intangible_asset
CY2012Q2	csgp	Par Value Of Company Held Auction Rate Securities ParValueOfCompanyHeldAuctionRateSecurities	28500000	USD
CY2012Q2	csgp	Period Deferred Cash Payment Is Due After Closing Of Acquisition PeriodDeferredCashPaymentIsDueAfterClosingOfAcquisition	P2Y
	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	5032000	USD
	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	4540000	USD
CY2011Q2	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	3384000	USD
CY2012Q2	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	4575000	USD
CY2012Q2	csgp	Restructuring Reserve Adjustment Sublease Revenue And Accretion RestructuringReserveAdjustmentSubleaseRevenueAndAccretion	39000	USD
CY2012Q1	csgp	Restructuring Reserve Adjustment Sublease Revenue And Accretion RestructuringReserveAdjustmentSubleaseRevenueAndAccretion	54000	USD
CY2011	csgp	Restructuring Reserve Adjustment Sublease Revenue And Accretion RestructuringReserveAdjustmentSubleaseRevenueAndAccretion	262000	USD
CY2012Q1	csgp	Second Excess Cash Flow Repayment Percentage SecondExcessCashFlowRepaymentPercentage	0.25
CY2011Q4	csgp	Segment Reporting Segment Gross Assets SegmentReportingSegmentGrossAssets	846991000	USD
CY2012Q2	csgp	Segment Reporting Segment Gross Assets SegmentReportingSegmentGrossAssets	1224602000	USD
CY2011Q2	csgp	Stock Issued During Period New Issues Cost Per Share Share StockIssuedDuringPeriodNewIssuesCostPerShareShare	60
	csgp	Stock Options And Restricted Stock StockOptionsAndRestrictedStock	424000	shares
CY2012Q2	csgp	Stock Options And Restricted Stock StockOptionsAndRestrictedStock	0	shares
CY2011Q2	csgp	Stock Options And Restricted Stock StockOptionsAndRestrictedStock	415000	shares
	csgp	Stock Options And Restricted Stock StockOptionsAndRestrictedStock	0	shares
CY2012Q2	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2012Q1	csgp	Third Excess Cash Flow Repayment Percentage ThirdExcessCashFlowRepaymentPercentage	0
CY2012Q2	csgp	Total Segment Liabilities TotalSegmentLiabilities	395591000	USD
CY2011Q4	csgp	Total Segment Liabilities TotalSegmentLiabilities	160997000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Period End Date DocumentPeriodEndDate	2012-06-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001057352
CY2012Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	28206438	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	COSTAR GROUP INC

Files In Submission

Name	View Source	Status
0001057352-12-000117-index-headers.html	Edgar Link	pending
0001057352-12-000117-index.html	Edgar Link	pending
0001057352-12-000117.txt	Edgar Link	pending
0001057352-12-000117-xbrl.zip	Edgar Link	pending
csgp-20120630.xml	Edgar Link	completed
csgp-20120630.xsd	Edgar Link	pending
csgp-20120630_cal.xml	Edgar Link	unprocessable
csgp-20120630_def.xml	Edgar Link	unprocessable
csgp-20120630_lab.xml	Edgar Link	unprocessable
csgp-20120630_pre.xml	Edgar Link	unprocessable
csgp-6302012x10q.htm	Edgar Link	pending
csgp-6302012xex311.htm	Edgar Link	pending
csgp-6302012xex312.htm	Edgar Link	pending
csgp-6302012xex321.htm	Edgar Link	pending
csgp-6302012xex322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
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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

2012 Q2 Form 10-Q Financial Statement

#000105735212000117 Filed on July 26, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP COSTAR GROUP, INC. Stock $csgp

2012 Q2 Form 10-Q Financial Statement

#000105735212000117 Filed on July 26, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP
COSTAR GROUP, INC. Stock $csgp