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Summary of Purchase Price (Detail) - USD ($)
$ in Thousands
9 Months Ended
Aug. 20, 2015
Feb. 17, 2015
Sep. 30, 2015
Business Acquisition [Line Items]      
Total purchase price     $ 2,000,000
Trulia      
Business Acquisition [Line Items]      
Cash paid in lieu of fractional outstanding shares   $ 41  
Total purchase price   1,966,420  
Trulia | Class A Common Stock      
Business Acquisition [Line Items]      
Value of stock issued and substituted share awards attributable to pre-combination service   1,883,728  
Trulia | Stock Option and Stock Appreciation Rights      
Business Acquisition [Line Items]      
Value of stock issued and substituted share awards attributable to pre-combination service   54,853  
Trulia | Restricted Stock Units      
Business Acquisition [Line Items]      
Value of stock issued and substituted share awards attributable to pre-combination service   $ 27,798  
DotLoop Inc      
Business Acquisition [Line Items]      
Total purchase price $ 105,538    
Cash paid for the outstanding stock and warrants of DotLoop 94,957    
Cash paid for the cancellation of vested options to purchase shares of DotLoop's common stock 5,640    
Certain transaction expenses and other costs incurred by DotLoop 4,750    
DotLoop Inc | Option Awards      
Business Acquisition [Line Items]      
Value of stock issued and substituted share awards attributable to pre-combination service $ 191