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Long-Term Debt (Detail Textuals 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2008 Interest Rate Swap | Dec. 31, 2008 Credit facility | Dec. 31, 2012 Credit facility | Dec. 31, 2012 Credit facility Minimum | Dec. 31, 2012 Credit facility Maximum | Dec. 31, 2012 Credit facility Option 1 A | Dec. 31, 2012 Credit facility Option 1 A Minimum | Dec. 31, 2012 Credit facility Option 1 A Maximum | Dec. 31, 2012 Credit facility Option 1 B | Dec. 31, 2012 Credit facility Option 1 C | Dec. 31, 2012 Credit facility Option 2 Eurodollar Borrowings | Dec. 31, 2012 Credit facility Option 2 Eurodollar Borrowings Minimum | Dec. 31, 2012 Credit facility Option 2 Eurodollar Borrowings Maximum
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of commitment fee for the unused portion of the credit facility |  |  |  |  | 0.25% | 0.35% |  |  |  |  |  |  |  |
Threshold limit of ratio of debt to earnings before interest taxes depreciation and amortization | no more than 2.5 to 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold limit of ratio of earnings before interest taxes depreciation and amortization to interest expenses | no less than 2 to 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding for self insurance programs and contract bids |  |  |  | $ 18.1 |  |  |  |  |  |  |  |  |  |
Amount of interest rate swap agreement |  | $ 50.0 | $ 18.1 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, basis for effective rate |  |  | 2.07% |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.50% | 1.00% |  |  |
Line of Credit Facility, Interest Rate Description |  |  |  |  |  |  | prime rate |  |  | Federal Funds Rate | LIBOR rate | Adjusted LIBOR |  |
Line Of Credit Facility Margin Percentage |  |  |  |  |  |  |  | 0.25% | 1.25% |  |  |  | 1.25% | 2.25%

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- Definition It indicates as percentage range of line of credit facility minimum based on quarterly debt covenant calculation. + References No definition available. + Details
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Period Type: | duration

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- Definition It indicates as a fixed rate per annum on revolving loans. + References No definition available. + Details
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Period Type: | duration

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- Definition Amount borrowed under the credit facility for the self-insurance programs and contract bids as of the balance sheet date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents threshold limit of the ratio of debt to earnings before interest taxes depreciation and amortization. + References No definition available. + Details
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- Definition This element represents threshold limit of the ratio of earnings before interest taxes depreciation and amortization to interest expenses. + References No definition available. + Details
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- Definition Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 98-5 -Paragraph 7 -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 Emerging Issues Task Force (EITF) -Number 00-27 -Paragraph 56 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Beneficial Conversion Feature -URI http://asc.fasb.org/extlink&oid=6505963 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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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- 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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