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Fair Values of Financial Instruments - Deferred Compensation Plan Commodity Hedging Agreements and Acquisition Related Contingent Consideration (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jul. 01, 2018
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Jan. 01, 2017
Assets:            
Commodity hedging agreements $ 1,281   $ 4,420      
Fair Value Level 1 [Member]            
Assets:            
Deferred compensation plan assets 36,291   33,166      
Liabilities:            
Deferred compensation plan liabilities 36,291   33,166      
Fair Value Level 2 [Member]            
Liabilities:            
Non-public variable rate debt 462,500   507,000      
Non-public fixed rate debt 256,200   126,400      
Public debt securities 457,800   475,100      
Fair Value Level 2 [Member] | Commodity Contract [Member]            
Assets:            
Commodity hedging agreements 1,281   4,420      
Fair Value Level 3 [Member]            
Liabilities:            
Acquisition related contingent consideration 363,836 $ 374,537 381,291 $ 308,933 $ 319,102 $ 253,437
Carrying Amount [Member]            
Assets:            
Deferred compensation plan assets 36,291   33,166      
Liabilities:            
Deferred compensation plan liabilities 36,291   33,166      
Non-public variable rate debt 462,031   506,398      
Non-public fixed rate debt 274,697   124,829      
Public debt securities 457,381   456,791      
Acquisition related contingent consideration 363,836   381,291      
Carrying Amount [Member] | Commodity Contract [Member]            
Assets:            
Commodity hedging agreements 1,281   4,420      
Total Fair Value [Member]            
Assets:            
Deferred compensation plan assets 36,291   33,166      
Liabilities:            
Deferred compensation plan liabilities 36,291   33,166      
Acquisition related contingent consideration 363,836   381,291      
Non-public variable rate debt 462,500   507,000      
Non-public fixed rate debt 256,200   126,400      
Public debt securities 457,800   475,100      
Total Fair Value [Member] | Commodity Contract [Member]            
Assets:            
Commodity hedging agreements $ 1,281   $ 4,420