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Long-Term Debt and Short-Term Borrowings - Revolving Credit Facility - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Letters of credit outstanding amount $ 50,900,000  
2015 Credit Agreement [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under Credit Agreement $ 2,800,000,000  
Revolving credit sub-facilities current borrowings capacity foreign currency fluctuation provision 5.00%  
2015 Credit Agreement [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 0.85%  
2015 Credit Agreement [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 1.00%  
2015 Credit Agreement [Member] | Canadian subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under Credit Agreement $ 75,000,000  
2015 Credit Agreement [Member] | Australian and New Zealand subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under Credit Agreement 100,000,000  
2015 Credit Agreement [Member] | U.K. subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under Credit Agreement 300,000,000  
Revolving credit facility [Member]    
Debt Instrument [Line Items]    
Letters of credit outstanding amount   $ 2,000,000
Revolving credit facility principal amount outstanding $ 0 0
Revolving credit facility [Member] | 2015 Credit Agreement [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under Credit Agreement   $ 2,600,000,000