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Long Term Debt - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Oct. 05, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2009
2009 Credit Facility
Mar. 31, 2009
2009 Credit Facility
Jul. 02, 2010
364-Day Credit Agreement
Aug. 19, 2010
2010 Credit Agreement
LegalMatter
Dec. 31, 2011
2010 Credit Agreement
Dec. 31, 2010
2010 Credit Agreement
Aug. 19, 2010
2010 Credit Agreement
Minimum
Point
Aug. 19, 2010
2010 Credit Agreement
Maximum
Dec. 31, 2011
2010 Credit Agreement
LIBOR
Aug. 19, 2010
2010 Credit Agreement
LIBOR
Minimum
Aug. 19, 2010
2010 Credit Agreement
LIBOR
Maximum
Dec. 31, 2011
2010 Credit Agreement
Base Rate
Aug. 19, 2010
2010 Credit Agreement
Base Rate
Minimum
Aug. 19, 2010
2010 Credit Agreement
Base Rate
Maximum
Aug. 19, 2010
2010 Credit Agreement
Revolving Credit Facility
Dec. 31, 2011
2010 Credit Agreement
Revolving Credit Facility
Dec. 31, 2011
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
Dec. 31, 2011
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
Dec. 31, 2011
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Dec. 31, 2010
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
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
Debt Disclosure [Line Items]                                                                      
Notes issuance date                                                         2010-10-05            
Aggregate amount by which the revolving credit facility can be increased                                     $ 100,000,000                                
Credit agreement date             2010-07-02 2010-08-19                                                      
Long-term debt, aggregate principal amount                                                         300,000,000            
Debt interest rate                                                         4.97% 4.97% 4.97%        
Debt maturity date                                     Aug. 19, 2013         Aug. 19, 2014         Oct. 05, 2020            
Credit facility, maximum borrowing capacity           240,000,000 250,000,000                       500,000,000                                
Debt maturity period             364 days                                                        
Debt issuance costs     10,779,000 6,169,000 6,169,000         10,779,000                                                  
Interest expense related to amortization of debt issuance costs                 2,400,000 1,100,000                                                  
Current aggregate borrowing capacity                                     400,000,000     150,000,000 40,000,000                        
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                                               2010-11-19                      
Description of the prepayment terms                                                         The 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            
Installment amounts percentage of the original principal amount                                                   1.25% 2.50% 5.00% 5.00%            
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 50% at any time. The note purchase 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 2.50 to 1.00. The note purchase agreement generally defines the interest coverage ratio as the ratio for the four prior quarters of EBITDA to interest charges for that same period.            
Financial covenant description               The Company must not permit its debt to capitalization ratio to exceed 45% at any time. The 2010 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 2010 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.                                                      
Number of compliance covenants               2                                         2            
Debt to capitalization ratio, percentage the Company must not exceed at any time                       45.00%                                         50.00%    
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter                     3                                         2.5      
Line of credit, amount outstanding                                       110,000,000         92,500,000                    
Line of credit, interest rate                                       4.05%         3.25%                    
Unfunded letters of credit, amount outstanding   40,600,000                                     40,600,000                            
Line of credit, available borrowing capacity                                       249,000,000                              
Repayment of revolving credit facility 200,000,000 43,100,000 200,000,000                                                                
Long-term debt, fair value                                                           $ 316,000,000          
Interest pay date                                                                   April 5 October 5
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium                                                               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.            
Acceptance terms, percent of principal before accrued and unpaid interest                                                         100.00%