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Long Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Revolving Credit Facility
Dec. 31, 2013
Term Loan Facility
Sep. 27, 2012
Credit Agreement
LegalMatter
Sep. 27, 2012
Credit Agreement
First Four Quarterly Installments
Sep. 27, 2012
Credit Agreement
Subsequent Eight Quarterly Installments
Sep. 27, 2012
Credit Agreement
Subsequent Four Quarterly Installments
Sep. 27, 2012
Credit Agreement
Amount For The Final Four Quarterly Installments
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Sep. 27, 2012
Credit Agreement
Term Loan Facility
Sep. 27, 2012
Credit Agreement
Maximum
Sep. 27, 2012
Credit Agreement
Minimum
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
LegalMatter
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
Maximum
Oct. 05, 2010
4.97% Series A Senior Notes, Due October 5th 2020
Minimum
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
LegalMatter
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
Maximum
Jun. 14, 2012
4.27% Series B Senior Notes, Due June 14th 2022
Minimum
Aug. 19, 2010
2010 Credit Agreement
Aug. 19, 2010
2010 Credit Agreement
Revolving Credit Facility
Aug. 19, 2010
2010 Credit Agreement
Term Loan Facility
Aug. 19, 2010
2010 Credit Agreement
Term Loan Facility
First Four Quarterly Installments
Aug. 19, 2010
2010 Credit Agreement
Term Loan Facility
Subsequent Eight Quarterly Installments
Aug. 19, 2010
2010 Credit Agreement
Term Loan Facility
Amount For Next Subsequent Three Quarterly Installments
Dec. 31, 2012
Credit Agreement
Dec. 31, 2010
Credit Agreement
4.97% Series A Senior Notes, Due October 5th 2020
Dec. 31, 2012
Credit Agreement
4.27% Series B Senior Notes, Due June 14th 2022
Sep. 27, 2012
Letter of Credit
Credit Agreement
Revolving Credit Facility
Sep. 27, 2012
Swing Line Facility
Credit Agreement
Revolving Credit Facility
Sep. 27, 2012
Term Loan
Credit Agreement
Revolving Credit Facility
Oct. 05, 2010
Semi Annual Payment, First Payment
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 14, 2012
Semi Annual Payment, First Payment
4.27% Series B Senior Notes, Due June 14th 2022
Oct. 05, 2010
Semi Annual Payment, Second Payment
4.97% Series A Senior Notes, Due October 5th 2020
Jun. 14, 2012
Semi Annual Payment, Second Payment
4.27% Series B Senior Notes, Due June 14th 2022
Dec. 31, 2013
London Interbank Offered Rate (LIBOR)
Sep. 27, 2012
London Interbank Offered Rate (LIBOR)
Credit Agreement
Maximum
Sep. 27, 2012
London Interbank Offered Rate (LIBOR)
Credit Agreement
Minimum
Dec. 31, 2013
Base Rate
Sep. 27, 2012
Base Rate
Credit Agreement
Maximum
Sep. 27, 2012
Base Rate
Credit Agreement
Minimum
Debt Disclosure [Line Items]                                                                                    
Credit agreement date                                         Aug. 19, 2010                                          
Credit facility, maximum borrowing capacity           $ 700,000,000                               $ 400,000,000                                        
Current aggregate borrowing capacity                     500,000,000                       100,000,000             150,000,000 40,000,000 100,000,000                    
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.                     The term loan facility was payable in quarterly principal installments commencing November 10, 2010. The installment amounts were scheduled to 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 and 5.00% of the original principal amount for the next subsequent three quarterly installments, with the balance due on the maturity date of August 19, 2014.                                      
Line of credit facility, frequency of payments           Quarterly                                 Quarterly                                      
Commencement date of principal payments           Dec. 27, 2012                                 Nov. 10, 2010                                      
Installment amounts percentage of the original principal amount             1.25% 2.50% 5.00% 13.75%                           1.25% 2.50% 5.00%                                
Aggregate amount by which the revolving credit facility can be increased                     100,000,000                                                              
Debt maturity date                     Sep. 27, 2017       Oct. 05, 2020     Jun. 14, 2022                                                
Applicable margin                                                                         2.25% 3.25% 2.25% 1.25% 2.25% 1.25%
Commitment fee payable to the lenders for the unused portion of the credit facility           0.50%                                                                        
Financial covenant description           The Company must not permit its debt to capitalization ratio to exceed 45%. 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 December 31, 2013.                                                                        
Number of compliance covenants           2                 2     2                                                
Debt to capitalization ratio, percentage the Company must not exceed at any time                         45.00%     50.00%     50.00%                                              
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter                           300.00%     250.00%     250.00%                                            
Line of credit, amount outstanding       0 92,500,000                                                                          
Line of credit facility, interest rate         2.50%                                                                          
Unfunded letters of credit, amount outstanding 39,800,000                                                                                  
Line of credit, available borrowing capacity 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%                                                
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 the same period. The Company was in compliance with these covenants at December 31, 2013.     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 the same period. The Company was in compliance with these covenants at December 31, 2013.                                                
Debt issuance costs   7,581,000                                                   10,800,000 7,600,000                          
Interest expense on debt extinguishment 28,359,000 22,750,000 15,652,000                                               978,000                              
Interest expense related to amortization of debt issuance costs $ 2,200,000 $ 3,400,000 $ 2,400,000