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Long Term Debt - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2010
Apr. 19, 2010
2010 Credit Agreement
LegalMatter
Jun. 30, 2012
2010 Credit Agreement
May 19, 2010
2010 Credit Agreement
Minimum
Apr. 19, 2010
2010 Credit Agreement
Minimum
Point
May 19, 2010
2010 Credit Agreement
Maximum
Apr. 19, 2010
2010 Credit Agreement
Maximum
Jun. 30, 2012
2010 Credit Agreement
LIBOR
May 19, 2010
2010 Credit Agreement
LIBOR
Minimum
May 19, 2010
2010 Credit Agreement
LIBOR
Maximum
Jun. 30, 2012
2010 Credit Agreement
Base Rate
May 19, 2010
2010 Credit Agreement
Base Rate
Minimum
May 19, 2010
2010 Credit Agreement
Base Rate
Maximum
Aug. 19, 2010
2010 Credit Agreement
Revolving Credit Facility
Jun. 30, 2012
2010 Credit Agreement
Revolving Credit Facility
Jun. 30, 2012
2010 Credit Agreement
Revolving Credit Facility
Letter of Credit
Aug. 19, 2010
2010 Credit Agreement
Revolving Credit Facility
Letter of Credit
Aug. 19, 2010
2010 Credit Agreement
Revolving Credit Facility
Swing Line Facility
Aug. 19, 2010
2010 Credit Agreement
Term Loan Facility
Jun. 30, 2012
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
Next Subsequent Three Quarterly Installments
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
Jun. 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                                   $ 400,000,000     $ 150,000,000 $ 40,000,000                                
Aggregate amount by which the revolving credit facility can be increased                                   100,000,000                                        
Debt maturity date                                   Aug. 19, 2013         Aug. 19, 2014         Oct. 05, 2020         Jun. 14, 2022          
Credit facility, maximum borrowing capacity                                   500,000,000                                        
Line of credit                                             100,000,000                              
Line of credit facility, frequency of payment and payment terms                                             The term loan facility is payable in quarterly principal installments commencing November 19, 2010. 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 next subsequent three quarterly installments, with the remainder becoming due at maturity.                              
Line of credit facility, frequency of payments                                             Quarterly                              
Commencement date of principal payments                                             Nov. 19, 2010                              
Installment amounts percentage of the original principal amount                                                 1.25% 2.50% 5.00%                      
Full repayment of term loan facility date                                             June 14, 2012                              
Applicable margin                       2.75% 2.75% 3.75% 1.75% 1.75% 2.75%                                          
Commitment fee payable to the lenders for the unused portion of the revolving credit facility             0.50% 0.50%   0.75%                                                        
Financial covenant description           The Company must not permit its debt to capitalization ratio to exceed 45% at any time. 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, 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                                     0         0                            
Unfunded letters of credit, amount outstanding 39,800,000   39,800,000                                 39,800,000                                    
Line of credit, available borrowing capacity                                     360,000,000                                      
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
Interest payment commencement date                                                                 October 5, 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         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 June 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 June 30, 2012.          
Debt issuance costs     1,549,000   10,800,000                                                         1,500,000        
Interest expense related to amortization of debt issuance costs $ 617,000.0 $ 604,000.0 $ 1,200,000 $ 1,200,000