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Debt - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Dec. 31, 2017
Nov. 30, 2017
Debt Instrument [Line Items]        
Long-term debt $ 1,147,951,000   $ 1,897,501,000  
Payments on debt 850,000,000 $ 64,000    
Line of credit maximum borrowing capacity $ 90,000,000   $ 91,000,000  
Line of credit interest rate during the period 1.48%   1.48%  
Notes Payable to Banks [Member]        
Debt Instrument [Line Items]        
Interest rate terms on debt The interest rates applicable to the 2017 Credit Agreement are, at the Company’s option, equal to either the alternate base rate (which is a rate per annum equal to the greatest of (a) the prime rate in effect on such day, (b) the Federal Reserve Bank of New York Rate on such day plus 1/2 of 1% per annum and (c) the adjusted LIBO rate on such day (or if such day is not a business day, the immediately preceding business day) for a deposit in U.S. dollars with a maturity of one month plus 1% per annum) or the applicable 1, 2, 3 or 6 month adjusted LIBO rate or EURIBO rate for Euro-denominated loans, in each case, plus an interest rate margin based upon the Company’s leverage ratio, which can range between 0 and 12.5 basis points for alternate base rate loans and between 80 and 112.5 basis points for LIBO rate or EURIBO rate loans.      
Debt facility fee The facility fee on the 2017 Credit Agreement ranges between 7.5 and 25 basis points per annum, based on the leverage ratio, of the amount of the revolving facility commitments and the outstanding term loan.      
Debt covenant description The 2017 Credit Agreement requires that the Company comply with an interest coverage ratio test of not less than 3.50:1 as of the end of any fiscal quarter for any period of four consecutive fiscal quarters and a leverage ratio test of not more than 3.50:1 as of the end of any fiscal quarter. In addition, the 2017 Credit Agreement includes negative covenants, affirmative covenants, representations and warranties and events of default that are customary for investment grade credit facilities.      
Unused borrowing capacity $ 1,208,000,000   $ 498,000,000  
Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt covenant description These senior unsecured notes require that the Company comply with an interest coverage ratio test of not less than 3.50:1 for any period of four consecutive fiscal quarters and a leverage ratio test of not more than 3.50:1 as of the end of any fiscal quarter. In addition, these senior unsecured notes include customary negative covenants, affirmative covenants, representations and warranties and events of default.      
Long-term debt $ 560,000,000   $ 700,000,000  
Call feature on debt instrument The Company may prepay all or some of the senior unsecured notes at any time in an amount not less than 10% of the aggregate principal amount outstanding, plus the applicable make-whole amount or prepayment premium for Series H and J senior unsecured notes. In the event of a change in control of the Company (as defined in the note purchase agreement), the Company may be required to prepay the senior unsecured notes at a price equal to 100% of the principal amount thereof, plus accrued and unpaid interest.      
Credit Agreements and Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Weighted-average interest rate 3.59%   2.98%  
Revolving Facilities [Member] | Notes Payable to Banks [Member]        
Debt Instrument [Line Items]        
Face value of debt       $ 1,500,000,000
Term Loan Facility [Member] | Notes Payable to Banks [Member]        
Debt Instrument [Line Items]        
Face value of debt       $ 300,000,000