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Derivative Instruments and Hedging Activities - Additional Information (Detail)
€ in Millions, £ in Millions, ZAR in Millions, CAD in Millions, AUD in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
CAD
Dec. 31, 2017
AUD
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
ZAR
Derivatives, Fair Value [Line Items]                
Hedge ineffectiveness in earnings $ 0 $ 0 $ 0          
Amount estimated reclassified as an increase to interest expense 500,000              
Fair value of derivatives in net asset position $ 6,100,000              
Maximum time frame for derivatives 15 months              
2.25% Interest Rate Swaps Matures on March 31, 2020 | Cash Flow Hedging                
Derivatives, Fair Value [Line Items]                
Variable-rate debt upon conversion     $ 625,000,000          
Fixed interest rate     2.25%          
Maturity date Mar. 31, 2020              
Interest rate swap | Cash Flow Hedging                
Derivatives, Fair Value [Line Items]                
Derivative notional amount $ 1,075,000,000              
Forward Contracts | Euro Member Countries, Euro                
Derivatives, Fair Value [Line Items]                
Derivative notional amount | €             € 70  
Forward Contracts | Australia, Dollars                
Derivatives, Fair Value [Line Items]                
Derivative notional amount | AUD         AUD 50      
Forward Contracts | Canada, Dollars                
Derivatives, Fair Value [Line Items]                
Derivative notional amount | CAD       CAD 65        
Forward Contracts | United Kingdom, Pounds                
Derivatives, Fair Value [Line Items]                
Derivative notional amount | £           £ 70.0    
Forward Contracts | South Africa, Rand                
Derivatives, Fair Value [Line Items]                
Derivative notional amount | ZAR               ZAR 656.9
Term Loan A-1 Facility | 0.98% Interest Rate Swaps Matures on March 31, 2020 | Cash Flow Hedging                
Derivatives, Fair Value [Line Items]                
Variable-rate debt upon conversion   $ 450,000,000            
Fixed interest rate   0.98%            
Maturity date Mar. 31, 2020