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Long Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |  | 0 Months Ended | 6 Months Ended |  | 1 Months Ended |  | 0 Months Ended | 6 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 6 Months Ended |  | 0 Months Ended |  | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Oct. 05, 2010 4.97% Series A Senior Notes, Due October 5th 2020 | Jun. 30, 2014 4.97% Series A Senior Notes, Due October 5th 2020 | Oct. 05, 2010 4.97% Series A Senior Notes, Due October 5th 2020 LegalMatter | Jun. 14, 2012 4.27% Series B Senior Notes, Due June 14th 2022 | Jun. 30, 2014 4.27% Series B Senior Notes, Due June 14th 2022 | Jun. 14, 2012 4.27% Series B Senior Notes, Due June 14th 2022 LegalMatter | Oct. 05, 2010 Minimum 4.97% Series A Senior Notes, Due October 5th 2020 | Jun. 14, 2012 Minimum 4.27% Series B Senior Notes, Due June 14th 2022 | Oct. 05, 2010 Maximum 4.97% Series A Senior Notes, Due October 5th 2020 | Jun. 14, 2012 Maximum 4.27% Series B Senior Notes, Due June 14th 2022 | Jun. 30, 2014 London Interbank Offered Rate (LIBOR) | Jun. 30, 2014 Base Rate | Jun. 30, 2014 Term Loan Facility | Jun. 30, 2014 Revolving Credit Facility | Sep. 27, 2012 Credit Agreement | Jun. 30, 2014 Credit Agreement | Sep. 27, 2012 Credit Agreement LegalMatter | Sep. 27, 2012 Credit Agreement Minimum | Sep. 27, 2012 Credit Agreement Maximum | Sep. 27, 2012 Credit Agreement London Interbank Offered Rate (LIBOR) Minimum | Sep. 27, 2012 Credit Agreement London Interbank Offered Rate (LIBOR) Maximum | Sep. 27, 2012 Credit Agreement Base Rate Minimum | Sep. 27, 2012 Credit Agreement Base Rate Maximum | Sep. 27, 2012 Credit Agreement Term Loan Facility | Jun. 30, 2014 Credit Agreement Term Loan Facility | Sep. 27, 2012 Credit Agreement Term Loan Facility | Sep. 27, 2012 Credit Agreement Term Loan Facility First Four Quarterly Installments | Sep. 27, 2012 Credit Agreement Term Loan Facility Subsequent Eight Quarterly Installments | Sep. 27, 2012 Credit Agreement Term Loan Facility Subsequent Four Quarterly Installments | Sep. 27, 2012 Credit Agreement Term Loan Facility Amount For The Final Four Quarterly Installments | Sep. 27, 2012 Credit Agreement Revolving Credit Facility | Sep. 27, 2012 Credit Agreement Revolving Credit Facility Letter of Credit | Sep. 27, 2012 Credit Agreement Revolving Credit Facility Swing Line Facility | Jun. 30, 2014 Semi Annual Payment, First Payment 4.97% Series A Senior Notes, Due October 5th 2020 | Jun. 30, 2014 Semi Annual Payment, First Payment 4.27% Series B Senior Notes, Due June 14th 2022 | Jun. 30, 2014 Semi Annual Payment, Second Payment 4.97% Series A Senior Notes, Due October 5th 2020 | Jun. 30, 2014 Semi Annual Payment, Second Payment 4.27% Series B Senior Notes, Due June 14th 2022
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current aggregate borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  | $ 500,000,000 | $ 150,000,000 | $ 40,000,000 |  |  |  |
Line of credit facility, frequency of payment and payment terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The term loan facility is payable in quarterly principal installments, which commenced 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. |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | Oct. 05, 2020 |  |  | Jun. 14, 2022 |  |  |  |  |  |  |  |  |  |  | Sep. 27, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% | 1.25% |  |  |  |  |  |  |  | 2.25% | 3.25% | 1.25% | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee payable to the lenders for the unused portion of the credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, 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 June 30, 2014. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of compliance covenants |  |  |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capitalization ratio, percentage the Company must not exceed at any time |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter |  |  |  |  |  |  |  |  |  |  | 250.00% | 250.00% |  |  |  |  |  |  |  |  |  | 300.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,500,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded letters of credit, amount outstanding | 39,800,000 |  | 39,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, available borrowing capacity | 460,000,000 |  | 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 | April 5 | October 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note purchase agreement, 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 of EBITDA for the four prior fiscal quarters to interest charges for that same period. The Company was in compliance with these covenants at June 30, 2014. |  |  | 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 of EBITDA for the four prior fiscal quarters to interest charges for that same period. The Company was in compliance with these covenants at June 30, 2014. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense related to amortization of debt issuance costs | $ 547,000 | $ 547,000 | $ 1,100,000 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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