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Schedule of Estimated Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 10, 2017
Jan. 01, 2017
2012 Seven Year Fixed Rate Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount   $ 916,650
Fair Value   932,233
2015 Class Five-Year Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 493,750 495,000
Fair Value 493,750 485,595
2015 Ten-Year Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount 790,000 792,000
Fair Value 805,800 $ 765,864
2017 Five-Year Fixed Rate Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount 600,000  
Fair Value 600,600  
2017 Ten-Year Fixed Rate Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount 1,000,000  
Fair Value 1,027,000  
2017 Five-Year Floating Rate Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount 300,000  
Fair Value $ 299,700