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Long Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 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
Dec. 31, 2012
Credit Agreement
LIBOR
Sep. 27, 2012
Credit Agreement
LIBOR
Minimum
Sep. 27, 2012
Credit Agreement
LIBOR
Maximum
Dec. 31, 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
Dec. 31, 2012
Credit Agreement
Revolving Credit Facility
Dec. 31, 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
Dec. 31, 2012
Credit Agreement
Term Loan Facility
Jun. 14, 2012
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
LegalMatter
Dec. 31, 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
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
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
Debt Disclosure [Line Items]                                                                                  
Credit agreement date                                                                       Aug. 19, 2010          
Credit facility, maximum borrowing capacity       $ 700,000,000                         $ 500,000,000                                       $ 400,000,000        
Current aggregate borrowing capacity                                       150,000,000 40,000,000 100,000,000                               100,000,000      
Line of credit facility, frequency of payment and payment terms                                             The term loan facility is payable in quarterly principal installments commencing 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               Jun. 14, 2022           Oct. 05, 2020                    
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 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 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, 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                                               98,800,000                                  
Line of credit facility, interest rate                                               2.625%                                  
Unfunded letters of credit, amount outstanding 39,800,000                                   39,800,000                                            
Line of credit, available borrowing capacity                                   460,000,000                                              
Notes issuance date                                                 Jun. 14, 2012           Oct. 05, 2010                    
Long-term debt, aggregate principal amount                                                 300,000,000           300,000,000                    
Debt interest rate                                                 4.27%           4.97%                    
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 7,581,000   10,779,000                                             7,600,000                              
Interest expense related to amortization of debt issuance costs 3,400,000 2,400,000 1,100,000                                                                            
Interest expense $ 978,000