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Long Term Debt - Senior Notes - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 25, 2019
USD ($)
Jan. 19, 2018
USD ($)
Jun. 14, 2012
USD ($)
Oct. 05, 2010
USD ($)
Sep. 30, 2019
USD ($)
Covenant
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Covenant
Sep. 30, 2018
USD ($)
Dec. 31, 2018
Debt Instrument [Line Items]                  
Loss on early extinguishment             $ (8,247,000)    
Repayment of borrowings               $ 347,000,000  
Proceeds from borrowings, before offering expenses               79,000,000  
Interest expense related to amortization of debt issuance costs         $ 526,000 $ 356,000 1,200,000 1,600,000  
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Repayment of borrowings   $ 239,000,000              
4.97% Series A Senior Notes, Due October 5th 2020                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount       $ 300,000,000          
Debt interest rate       4.97%          
Notes issuance date       Oct. 05, 2010          
Debt Instrument principle including make-whole premium $ 308,000,000                
Debt instrument, redemption percentage 100.00%                
Loss on early extinguishment $ 8,200,000                
Interest expense related to amortization of debt issuance costs         $ 185,000   $ 185,000    
4.27% Series B Senior Notes, Due June 14th 2022                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount     $ 300,000,000            
Debt interest rate     4.27%            
Notes issuance date     Jun. 14, 2012            
Debt instrument, redemption percentage     100.00%            
Debt maturity date     Jun. 14, 2022            
Semi-annual interest payment, first payment date             April 5    
Semi-annual interest payment, second payment date             October 5    
Description of the prepayment terms             Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreement. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.    
Description of the acceptance terms             If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.    
Acceptance terms, percent of principal before accrued and unpaid interest     100.00%            
Number of compliance covenants | Covenant         2   2    
Note purchase agreement, financial covenant description             The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit its interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreement generally defines the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2019.    
4.27% Series B Senior Notes, Due June 14th 2022 | Minimum                  
Debt Instrument [Line Items]                  
Debt instrument, prepayment percentage of aggregate principal amount     5.00%            
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter         250.00%   250.00%    
4.27% Series B Senior Notes, Due June 14th 2022 | Maximum                  
Debt Instrument [Line Items]                  
Debt to capitalization ratio, percentage the Company must not exceed at any time             50.00%    
3.95% Senior Notes Due 2028                  
Debt Instrument [Line Items]                  
Long-term debt, aggregate principal amount   $ 525,000,000              
Debt interest rate   3.95%     3.95%   3.95%   3.95%
Debt instrument, redemption percentage   100.00%              
Debt maturity date   Feb. 01, 2028              
Proceeds from borrowings, before offering expenses   $ 521,000,000              
Debt payment term             The Company pays interest on the 2028 Notes on February 1 and August 1 of each year.    
Debt instrument redemption description             The Company, at its option, may redeem the Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such 2028 Notes to be redeemed, plus accrued and unpaid interest, if any, on those 2028 Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, the Company, at its option, may redeem the 2028 Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the 2028 Notes to be redeemed, plus accrued and unpaid interest, if any, on those 2028 Notes to the redemption date.    
Debt instrument redemption upon the occurrence of change of control, description             Upon the occurrence of a change of control, as defined in the indenture, each holder of the 2028 Notes may require the Company to purchase all or a portion of such holder’s 2028 Notes at a price equal to 101% of their principal amount, plus accrued and unpaid interest, if any, to, but excluding, the repurchase date.    
Redemption price percentage of principal amount of debt instrument on change of control   101.00%              
Previous Credit Agreement                  
Debt Instrument [Line Items]                  
Interest expense related to amortization of debt issuance costs               $ 317,000