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Borrowings - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
Feb. 29, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Feb. 29, 2016
AUD
Minimum [Member]          
Debt Instrument [Line Items]          
Interest coverage ratio       300.00%  
Maximum [Member]          
Debt Instrument [Line Items]          
Net leverage ratio 325.00%   325.00% 325.00%  
REA Group [Member]          
Debt Instrument [Line Items]          
Lenders' fees   $ 1,000,000      
Weighted average interest rate     2.70% 2.80%  
Interest paid     $ 3,000,000 $ 8,000,000  
REA Group [Member] | Unsecured Revolving Loan Facility [Member]          
Debt Instrument [Line Items]          
Amounts drawn under credit facility   $ 340,000,000     AUD 480,000,000
REA Group [Member] | Minimum [Member] | Australian BBSY [Member]          
Debt Instrument [Line Items]          
Applicable margin for borrowing 0.85% 0.85%      
REA Group [Member] | Maximum [Member] | Australian BBSY [Member]          
Debt Instrument [Line Items]          
Applicable margin for borrowing 1.05% 1.45%      
REA Group [Member] | iProperty Group Limited [Member] | Unsecured Revolving Loan Facility [Member]          
Debt Instrument [Line Items]          
Maximum amount of credit facility | AUD         480,000,000
Facility Due December 2017 [Member] | REA Group [Member] | iProperty Group Limited [Member] | Unsecured Revolving Loan Facility [Member]          
Debt Instrument [Line Items]          
Maximum amount of credit facility | AUD         120,000,000
Credit Agreement maturity       2017-12  
Facility Due December 2018 [Member] | REA Group [Member] | iProperty Group Limited [Member] | Unsecured Revolving Loan Facility [Member]          
Debt Instrument [Line Items]          
Maximum amount of credit facility | AUD         120,000,000
Credit Agreement maturity       2018-12  
Facility Due December 2019 [Member] | REA Group [Member] | iProperty Group Limited [Member] | Unsecured Revolving Loan Facility [Member]          
Debt Instrument [Line Items]          
Maximum amount of credit facility | AUD         AUD 240,000,000
Credit Agreement maturity       2019-12  
Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Maximum amount of credit facility $ 900,000,000   900,000,000 $ 900,000,000  
Amounts drawn under credit facility 0   0 0  
Unsecured revolving credit facility available amount 650,000,000   650,000,000 650,000,000  
Letters of credit sublimit under credit facility $ 100,000,000   $ 100,000,000 $ 100,000,000  
Credit Agreement due date       Oct. 23, 2020  
Interest on borrowings, description       Either (a) a Eurodollar Rate formula or (b) the Base Rate formula, each as set forth in the Credit Agreement.  
Commitment fee percentage on undrawn balance 0.225%        
Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Applicable margin for borrowing 0.50%        
Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member] | Eurodollar [Member]          
Debt Instrument [Line Items]          
Applicable margin for borrowing 1.50%        
Credit Agreement [Member] | Minimum [Member] | Unsecured Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Interest coverage ratio       300.00%  
Credit Agreement [Member] | Maximum [Member] | Unsecured Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Operating income leverage ratio       300.00%