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Long Term Debt - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 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
LegalMatter
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
Jun. 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
LegalMatter
Oct. 05, 2010
Minimum
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 14, 2012
Minimum
4.27% Series B Senior Notes, Due June 14th 2022
Oct. 05, 2010
Maximum
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 14, 2012
Maximum
4.27% Series B Senior Notes, Due June 14th 2022
Jun. 30, 2014
London Interbank Offered Rate (LIBOR)
Jun. 30, 2014
Base Rate
Jun. 30, 2014
Term Loan Facility
Jun. 30, 2014
Revolving Credit Facility
Sep. 27, 2012
Credit Agreement
Jun. 30, 2014
Credit Agreement
Sep. 27, 2012
Credit Agreement
LegalMatter
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
Jun. 30, 2014
Credit Agreement
Term Loan Facility
Sep. 27, 2012
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
Jun. 30, 2014
Semi Annual Payment, First Payment
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 30, 2014
Semi Annual Payment, First Payment
4.27% Series B Senior Notes, Due June 14th 2022
Jun. 30, 2014
Semi Annual Payment, Second Payment
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 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 June 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                                 87,500,000 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                                                                            
Notes issuance date         Oct. 05, 2010     Jun. 14, 2012                                                                  
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
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     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                                                                
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 June 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 June 30, 2014.                                                                
Interest expense related to amortization of debt issuance costs $ 547,000 $ 547,000 $ 1,100,000 $ 1,100,000