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Long-Term Debt Obligations (Details) (USD $) |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  |  |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Revolving credit facility item | Sep. 23, 2011 Revolving credit facility | Mar. 31, 2013 Revolving credit facility EAS | Mar. 31, 2013 Revolving credit facility Through December 31, 2013 | Mar. 31, 2013 Revolving credit facility Through June 30, 2014 | Mar. 31, 2013 Revolving credit facility Through maturity | Mar. 31, 2013 Revolving credit facility Actual | Mar. 31, 2013 Revolving credit facility Minimum | Mar. 31, 2013 Revolving credit facility Minimum Covenant Requirement | Mar. 31, 2013 Revolving credit facility Maximum | Mar. 31, 2013 Revolving credit facility Maximum Covenant Requirement Through December 31, 2013 | Mar. 31, 2013 Revolving credit facility Maximum Covenant Requirement Through June 30, 2014 | Mar. 31, 2013 Revolving credit facility Maximum Covenant Requirement Through maturity | Mar. 31, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Mar. 31, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.25 | Mar. 31, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.25 to 2.00 | Mar. 31, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.00 to 2.50 | Mar. 31, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.50 or greater | Mar. 31, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Mar. 31, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.25 | Mar. 31, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.25 to 2.00 | Mar. 31, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.00 to 2.50 | Mar. 31, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.50 or greater | Mar. 31, 2013 Other debt | Dec. 31, 2012 Other debt | Mar. 31, 2013 Notes to former owners | Dec. 31, 2012 Notes to former owners
Long-Term Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 7,400,000 | $ 7,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 2,400,000 | $ 5,000,000 | $ 5,000,000
Less - current portion | (300,000) | (300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (300,000) |  |  |
Total long-term portion of debt | 7,100,000 | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  | 125,000,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit amount outstanding |  |  | 53,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit available |  |  | 71,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate options |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin added under: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Base rate | Base rate | Base rate | Base rate | Base rate | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% | 1.00% | 1.25% | 1.50% | 1.75% | 1.75% | 2.00% | 2.25% | 2.50% | 2.75% |  |  |  |
Weighted average interest rate (as a percent) |  |  | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30% |  | 3.30% |
Letter of credit fees (as a percent) |  |  |  |  |  |  |  |  |  | 1.30% |  | 2.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees payable on unused portion of the facility (as a percent) |  |  |  |  |  |  |  |  |  | 0.25% |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal financial covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  | 0.14 |  |  | 3.00 | 2.75 | 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio used to determine exclusion of stock repurchases and the payment of dividends for calculation of the fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 | 1.50 | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  | 18.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permitted amount of acquisitions per transaction |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period prior to acquisition for which aggregate purchase price is considered for determining permitted amount of acquisitions per transaction |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio used as basis for other restrictions |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for the calculation of the fixed charge coverage ratio. + References No definition available. + Details
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- Definition Represents the ratio of consolidated adjusted earnings before, interest, taxes, depreciation and amortization, less non-financed capital expenditures, tax provision, dividends and amounts used to repurchase stock to the sum of interest expense and scheduled principal payments of indebtedness required to be maintained under the financial covenants. + References No definition available. + Details
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- Definition Represents the ratio of consolidated total debt to consolidated adjusted earnings before, interest, taxes, depreciation and amortization required to be maintained under the financial covenants. + References No definition available. + Details
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- Definition Represents the net leverage ratio used to determine exclusion of stock repurchases and the payment of dividends for calculation of the fixed charge coverage ratio under the financial covenants. + References No definition available. + Details
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- Definition Represents the aggregate purchase price of current acquisition and acquisitions in the preceding twelve month period used for determining the permitted amount of acquisition per transaction under the financial covenants. + References No definition available. + Details
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- Definition Represents the number of interest rate options. + References No definition available. + Details
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- Definition Represents the fees for the letter of credit facility, expressed as a percent based on the ratio of consolidated total indebtedness to credit facility adjusted EBITDA, as defined in the credit agreement. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). It includes, but is not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -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 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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