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Notes Payable - Additional Information (Detail) - USD ($)
 12 Months Ended
Apr. 23, 2024
Sep. 27, 2023
Jun. 08, 2023
Jul. 15, 2022
Jun. 16, 2021
Mar. 17, 2021
Dec. 31, 2024
Dec. 31, 2023
Aug. 19, 2022
Debt Instrument [Line Items]                  
Consolidated Fixed Charge Coverage Ratio             2.50%    
Consolidated Fixed Charge Coverage Ratio, actual             3.19%    
Consolidated Leverage Ratio             275.00%    
Consolidated Leverage Ratio, actual             1.68%    
Senior notes principal balance outstanding             $ 590,440,000 $ 763,000,000  
Note Purchase Agreement [Member] | Notes Issued March 17, 2021 and Due March 17, 2028 [Member]                  
Debt Instrument [Line Items]                  
Proceeds from issuance of senior notes     $ 40,000,000            
Senior notes interest rate     2.57%            
Debt instrument, maturity date             Mar. 17, 2028    
Note Purchase Agreement [Member] | Notes Issued June 16, 2021 And Due June 16, 2026 [Member]                  
Debt Instrument [Line Items]                  
Proceeds from issuance of senior notes     $ 60,000,000            
Senior notes interest rate     2.35%            
Debt instrument, maturity date               Jun. 16, 2026  
Shelf Notes [Member]                  
Debt Instrument [Line Items]                  
Proceeds from issuance of senior notes     $ 300,000,000            
Senior notes description             In addition, pursuant to the Note Purchase Agreement, the Company may authorize the issuance and sale of additional senior notes (the “Shelf Notes”) in the aggregate principal amount of (x) $300 million minus (y) the amount of other notes (such as the Series D Senior Notes, Series E Senior Notes and Series F Senior Notes, each defined below) then outstanding, to be dated the date of issuance thereof, to mature, in case of each Shelf Note so issued, no more than 15 years after the date of original issuance thereof, to have an average life, in the case of each Shelf Note so issued, of no more than 15 years after the date of original issuance thereof, to bear interest on the unpaid balance thereof from the date thereof at the rate per annum, and to have such other particular terms, as shall be set forth, in the case of each Shelf Note so issued, in accordance with the Note Purchase Agreement.    
2.57% Series D senior notes due in 2028 [Member] | Series C Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Proceeds from issuance of senior notes           $ 40,000,000.0      
Senior notes interest rate           2.57% 2.57% 2.57%  
Debt instrument, maturity date             Mar. 17, 2028    
Senior notes description             Interest on the Series D Senior Notes is payable semi-annually beginning on September 17, 2021 and continuing thereafter on March 17 and September 17 of each year until maturity.    
Senior notes interest payment             semi-annually    
Debt instrument, date of first required payment             Sep. 17, 2021    
Senior notes principal balance outstanding             $ 40,000,000 $ 40,000,000  
Notes payable amount net             $ 40,000,000.0    
2.35% Series E senior notes due in 2026 [Member] | Series E Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Proceeds from issuance of senior notes         $ 60,000,000.0        
Senior notes interest rate         2.35%   2.35% 2.35%  
Debt instrument, maturity date             Jun. 16, 2026    
Senior notes description             Interest on the Series E Senior Notes is payable semi-annually beginning on December 16, 2021 and continuing thereafter on June 16 and December 16 of each year until maturity.    
Senior notes interest payment             semi-annually    
Debt instrument, date of first required payment             Dec. 16, 2021    
Senior notes principal balance outstanding             $ 60,000,000 $ 60,000,000  
6.25% Series F senior notes due in 2030 [Member] | Series F Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Proceeds from issuance of senior notes   $ 75,000,000              
Senior notes interest rate   6.25%         6.25% 6.25%  
Debt instrument, maturity date             Sep. 27, 2030    
Senior notes description             Interest on the Series F Senior Notes is payable semi-annually beginning on March 27, 2024 and continuing thereafter on September 27 and March 27 of each year until maturity.    
Senior notes interest payment             semi-annually    
Senior notes principal balance outstanding             $ 75,000,000 $ 75,000,000  
Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Credit facility, maximum       $ 650,000,000          
Revolving credit facility, maturity date             Jul. 15, 2027    
Additional senior notes indebtedness       250,000          
Consolidated Fixed Charge Coverage Ratio             2.50%    
Debt instrument description of variable rate basis             (i) SOFR plus a defined margin, or (ii) the Agent bank’s prime rate (“base rate”) plus a margin. The applicable margin for each type of loan is measured based upon the Consolidated Leverage Ratio at the end of the prior fiscal quarter and ranges from 1.00% to 1.75% for SOFR loans and 0% to 0.75% for base rate loans. In addition, the Company pays an unused commitment fee for the portion of the $650.0 million credit facility that is not used. These fees are based upon the Consolidated Leverage Ratio and range from 0.15% to 0.30%. As of December 31, 2024 and 2023, the applicable margins were 1.25% for SOFR based loans, 0.25% for base rate loans and 0.20% for unused fees. Amounts borrowed under the Sweep Service Facility are based upon the MUFG Union Bank, N.A. base rate plus an applicable margin and an unused commitment fee for the portion of the $20.0 million facility not used.    
Credit Facility [Member] | Unused Fees [Member]                  
Debt Instrument [Line Items]                  
Debt instrument interest rate at period end             0.20% 0.20%  
Credit Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Leverage ratio             0.15%    
Credit Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Leverage ratio             0.30%    
Credit Facility [Member] | LIBOR Loans [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Leverage ratio             1.00%    
Credit Facility [Member] | SOFR Loans [Member]                  
Debt Instrument [Line Items]                  
Debt instrument interest rate at period end             1.25% 1.25%  
Credit Facility [Member] | SOFR Loans [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Leverage ratio             1.75%    
Credit Facility [Member] | Base Rate Loans [Member]                  
Debt Instrument [Line Items]                  
Debt instrument interest rate at period end             0.25% 0.25%  
Credit Facility [Member] | Base Rate Loans [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Leverage ratio             0.00%    
Credit Facility [Member] | Base Rate Loans [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Leverage ratio             0.75%    
Credit Facility [Member] | MUFG Union Bank, N.A [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maturity date             Jul. 15, 2027    
Credit Facility [Member] | Treasury Sweep Note Due July FifteenTwo Thousand Twenty Seven [Member]                  
Debt Instrument [Line Items]                  
Credit facility, indebtedness       20,000          
Revolving credit facility, maturity date             Jul. 15, 2027    
Credit Facility [Member] | Notes Issued March 17, 2021 and Due March 17, 2028 [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maturity date             Mar. 17, 2028    
Credit facility, aggregate outstanding principal       40,000,000          
Credit Facility [Member] | Notes Issued November 5, 2015 And Paid November 5, 2022 [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maturity date             Nov. 05, 2022    
Credit facility, aggregate outstanding principal       60,000,000          
Credit Facility [Member] | Notes Issued June 16, 2021 And Due June 16, 2026 [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, maturity date             Jun. 16, 2026    
Credit facility, aggregate outstanding principal       60,000,000          
Credit Facility [Member] | Sweep Service Facility [Member]                  
Debt Instrument [Line Items]                  
Credit facility, maximum             $ 650,000,000    
Credit facility, aggregate outstanding principal             342,400,000    
Unused commitment fees             20,000,000.0    
Additional borrowing capacity             $ 307,600,000    
Credit Facility [Member] | One or More Tranches [Member]                  
Debt Instrument [Line Items]                  
Revolving credit facility, available maximum borrowing capacity       950,000,000          
Letters of Credit [Member]                  
Debt Instrument [Line Items]                  
Credit facility, maximum       40,000,000          
Swingline Loans [Member]                  
Debt Instrument [Line Items]                  
Credit facility, maximum       20,000,000          
Unsecured revolving credit facility before Renewal [Member]                  
Debt Instrument [Line Items]                  
Credit facility, maximum       $ 420,000,000          
Consolidated Fixed Charge Coverage Ratio, actual             3.19%    
Consolidated Leverage Ratio             2.75%    
Consolidated Leverage Ratio, actual             1.68%    
Unused commitment fees             $ 650,000,000    
Unsecured revolving credit facility before Renewal [Member] | MUFG Union Bank, N.A [Member]                  
Debt Instrument [Line Items]                  
Credit facility, maximum                 $ 20,000,000
Incremental Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Credit facility, aggregate outstanding principal $ 75,000,000                
Repayment of revolving loans $ 75,000,000