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Long Term Debt - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2012
Aug. 19, 2010
2010 Credit Agreement
LegalMatter
Mar. 31, 2012
2010 Credit Agreement
Mar. 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
Mar. 31, 2012
2010 Credit Agreement
Revolving Credit Facility
Mar. 31, 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
Mar. 31, 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
Mar. 31, 2012
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Dec. 31, 2011
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]                                                            
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            
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                                     2010-11-19                      
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 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 March 31, 2012.                                                        
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           3.00                                         2.50      
Line of credit, amount outstanding                             109,000,000         90,000,000                    
Line of credit, interest rate                             3.28%         3.00%                    
Unfunded letters of credit, amount outstanding 40,600,000                             40,600,000                            
Line of credit, available borrowing capacity                             251,000,000                              
Notes issuance date                                               2010-10-05            
Long-term debt, aggregate principal amount                                               300,000,000            
Debt interest rate                                               4.97% 4.97% 4.97%        
Long-term debt, fair value                                                 323,000,000          
Interest pay date                                                         April 5 October 5
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            
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%            
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. The Company was in compliance with these covenants at March 31, 2012.            
Debt issuance costs         10,800,000                                                  
Interest expense related to amortization of debt issuance costs     $ 604,000 $ 604,000