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Long Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  |  |  |  | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 9 Months Ended |  | 1 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 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 | Sep. 30, 2012 Credit Agreement LIBOR | Sep. 27, 2012 Credit Agreement LIBOR Minimum | Sep. 27, 2012 Credit Agreement LIBOR Maximum | Sep. 30, 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 | Sep. 30, 2012 Credit Agreement Revolving Credit Facility | Sep. 30, 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 | Sep. 30, 2012 Credit Agreement Term Loan Facility | 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 | Sep. 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  | $ 150,000,000 | $ 40,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, frequency of payment and payment terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The term loan facility will be payable in quarterly principal installments commencing December 27, 2012, and 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 27, 2017 |  |  |  |  |  |  |  | Oct. 05, 2020 |  |  |  |  | Jun. 14, 2022 |  |  |  |  |
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 revolving 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 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 September 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Unfunded letters of credit, amount outstanding | 39,800,000 |  | 39,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 | 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 |  |  | 7,531,000 |  | 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |
Interest expense related to amortization of debt issuance costs | 1,600,000 | 604,000 | 2,800,000 | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense | $ 978,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Description of the frequency of the required periodic payments of interest, principal, or both, and the amount, if set, or a description of a formula upon which payment is based. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the frequency of periodic payments, which may be presented in a variety of ways (for example, monthly, quarterly, annually). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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