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Long Term Debt - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2010
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
Minimum
Point
Sep. 27, 2012
Credit Agreement
Maximum
Sep. 30, 2012
Credit Agreement
LIBOR
Sep. 27, 2012
Credit Agreement
LIBOR
Minimum
Sep. 27, 2012
Credit Agreement
LIBOR
Maximum
Sep. 30, 2012
Credit Agreement
Base Rate
Sep. 27, 2012
Credit Agreement
Base Rate
Minimum
Sep. 27, 2012
Credit Agreement
Base Rate
Maximum
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Sep. 30, 2012
Credit Agreement
Revolving Credit Facility
Sep. 30, 2012
Credit Agreement
Revolving Credit Facility
Letter of Credit
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Letter of Credit
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Swing Line Facility
Sep. 27, 2012
Credit Agreement
Revolving Credit Facility
Term Loan
Sep. 27, 2012
Credit Agreement
Term Loan Facility
Sep. 30, 2012
Credit Agreement
Term Loan Facility
Oct. 05, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
LegalMatter
Oct. 05, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Minimum
Point
Oct. 05, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Maximum
Oct. 05, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Semi Annual Payment, First Payment
Oct. 05, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Semi Annual Payment, Second Payment
Jun. 14, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
LegalMatter
Sep. 30, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
Jun. 14, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
Minimum
Point
Jun. 14, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
Maximum
Jun. 14, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
Semi Annual Payment, First Payment
Jun. 14, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
Semi Annual Payment, Second Payment
Debt Disclosure [Line Items]                                                                          
Current aggregate borrowing capacity                                     $ 500,000,000     $ 150,000,000 $ 40,000,000 $ 100,000,000                          
Line of credit facility, frequency of payment and payment terms                                                 The term loan facility will be payable in quarterly principal installments commencing December 27, 2012, and 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                                     Sep. 27, 2017               Oct. 05, 2020         Jun. 14, 2022          
Applicable margin                         2.25% 2.25% 3.25% 1.25% 1.25% 2.25%                                      
Commitment fee payable to the lenders for the unused portion of the revolving credit facility           0.50%                                                              
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 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, 2012.                                                              
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                     3.00                                 2.50           2.50      
Line of credit, amount outstanding                                       100,000,000           0                      
Unfunded letters of credit, amount outstanding 39,800,000   39,800,000                                   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 October 5         April 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 for the four prior quarters of EBITDA to interest charges for that same period. The Company was in compliance with these covenants at September 30, 2012.         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 for the four prior quarters of EBITDA to interest charges for that same period. The Company was in compliance with these covenants at September 30, 2012.          
Debt issuance costs     7,531,000   10,800,000                                                       7,500,000        
Interest expense related to amortization of debt issuance costs 1,600,000 604,000 2,800,000 1,800,000                                                                  
Interest Expense $ 978,000