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Long Term Debt - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
London Interbank Offered Rate (LIBOR)
Sep. 30, 2014
Base Rate
Sep. 30, 2014
Term Loan Facility
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
LegalMatter
Sep. 30, 2014
4.97% Series A Senior Notes, Due October 5th 2020
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
Minimum
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
Maximum
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
LegalMatter
Sep. 30, 2014
4.27% Series B Senior Notes, Due June 14th 2022
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
Minimum
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
Maximum
Sep. 30, 2014
Revolving Credit Facility
Sep. 27, 2012
Credit Agreement
LegalMatter
Sep. 30, 2014
Credit Agreement
Sep. 27, 2012
Credit Agreement
Minimum
Sep. 27, 2012
Credit Agreement
Maximum
Sep. 27, 2012
Credit Agreement
London Interbank Offered Rate (LIBOR)
Minimum
Sep. 27, 2012
Credit Agreement
London Interbank Offered Rate (LIBOR)
Maximum
Sep. 27, 2012
Credit Agreement
Base Rate
Minimum
Sep. 27, 2012
Credit Agreement
Base Rate
Maximum
Sep. 27, 2012
Credit Agreement
Term Loan Facility
Sep. 30, 2014
Credit Agreement
Term Loan Facility
Sep. 27, 2012
Credit Agreement
Term Loan Facility
First Four Quarterly Installments
Sep. 27, 2012
Credit Agreement
Term Loan Facility
Subsequent Eight Quarterly Installments
Sep. 27, 2012
Credit Agreement
Term Loan Facility
Subsequent Four Quarterly Installments
Sep. 27, 2012
Credit Agreement
Term Loan Facility
Amount For The Final Four Quarterly Installments
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Letter of Credit
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Swing Line Facility
Sep. 30, 2014
Semi Annual Payment, First Payment
4.97% Series A Senior Notes, Due October 5th 2020
Sep. 30, 2014
Semi Annual Payment, First Payment
4.27% Series B Senior Notes, Due June 14th 2022
Sep. 30, 2014
Semi Annual Payment, Second Payment
4.97% Series A Senior Notes, Due October 5th 2020
Sep. 30, 2014
Semi Annual Payment, Second Payment
4.27% Series B Senior Notes, Due June 14th 2022
Debt Disclosure [Line Items]                                                                          
Current aggregate borrowing capacity                                                 $ 100,000,000           $ 500,000,000 $ 150,000,000 $ 40,000,000        
Line of credit facility, frequency of payment and payment terms                                                   The term loan facility is payable in quarterly principal installments, which commenced December 27, 2012. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments, 5.00% of the original principal amount for the subsequent four quarterly installments and 13.75% of the original principal amount for the final four quarterly installments.                      
Line of credit facility, frequency of payments                                                 Quarterly                        
Commencement date of principal payments                                                 Dec. 27, 2012                        
Installment amounts percentage of the original principal amount                                                     1.25% 2.50% 5.00% 13.75%              
Aggregate amount by which the revolving credit facility can be increased                                 100,000,000                                        
Credit facility, maximum borrowing capacity                                 700,000,000                                        
Debt maturity date               Oct. 05, 2020       Jun. 14, 2022         Sep. 27, 2017                                        
Applicable margin         2.25% 1.25%                             2.25% 3.25% 1.25% 2.25%                          
Commitment fee payable to the lenders for the unused portion of the credit facility                                 0.50%                                        
Credit agreement, financial covenant description                                   The Company must not permit its debt to capitalization ratio to exceed 45%. The Credit 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 the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2014                                      
Number of compliance covenants               2       2         2                                        
Debt to capitalization ratio, percentage the Company must not exceed at any time                     50.00%       50.00%         45.00%                                  
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter                   250.00%       250.00%         300.00%                                    
Line of credit, amount outstanding             85,000,000                 0                                          
Line of credit facility, interest rate             2.50%                                                            
Unfunded letters of credit, amount outstanding 39,800,000   39,800,000                                                                    
Line of credit, available borrowing capacity 460,000,000   460,000,000                                                                    
Long-term debt, aggregate principal amount               300,000,000       300,000,000                                                  
Debt interest rate               4.97%       4.27%                                                  
Interest pay date                                                                   April 5 April 5 October 5 October 5
Notes issuance date               Oct. 05, 2010       Jun. 14, 2012                                                  
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 agreements. 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.       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 agreements. 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.                                                
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium                   100.00%       100.00%                                              
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.       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%       100.00%                                                  
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 agreements generally define 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 the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for that same period. The Company was in compliance with these covenants at September 30, 2014.       The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define 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 the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for that same period. The Company was in compliance with these covenants at September 30, 2014.                                                
Interest expense related to amortization of debt issuance costs $ 547,000 $ 547,000 $ 1,600,000 $ 1,600,000