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Indebtedness - Additional Information (Detail)
€ in Millions
May. 12, 2015
Mar. 10, 2015
USD ($)
May. 11, 2015
USD ($)
Mar. 09, 2015
EUR (€)
Mar. 09, 2015
USD ($)
2015 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument Face Amount | €       € 500  
Debt Instrument Interest Rate Stated Percentage       1.75% 1.75%
Minimum Percentage Of Aggregate Principal Amount Of All Notes   25.00%      
Percentage Of Principal Amount Being Prepaid Plus Accrued And Unpaid Interest   100.00%      
Percentage Of Principal Amount Plus Accrued And Unpaid Interest To Date Of Purchase   101.00%      
Aggregate Amount For Default         $ 50,000,000
Minimum Amount For Default On Senior Notes Payable   $ 50,000,000      
2012 Credit Facility [Member]          
Debt Instrument [Line Items]          
Senior unsecured revolving credit facility     $ 1,000,000,000    
2015 Credit Facility [Member]          
Debt Instrument [Line Items]          
Senior unsecured revolving credit facility     $ 1,000,000,000    
Interest rate description LIBOR plus a premium that can range from 79.5 basis points to 120 basis points per annum        
Debt/EBITDA ratio 4        
2015 Credit Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument Fee Period Percentage     0.0008    
2015 Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument Fee Period Percentage     0.00175