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Acquisitions and Other Investments (Schedule of Business Acquisitions, Consideration Paid and Purchase Price Allocation) (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | May 02, 2013 Big Country [Member] | May 02, 2013 Big Country [Member] Backlog [Member] | May 02, 2013 Big Country [Member] Noncompete Agreements [Member] | May 02, 2013 Big Country [Member] Customer Relationships [Member] | May 02, 2013 Big Country [Member] Pre-Qualifications [Member] | May 02, 2013 Big Country [Member] Other Current Assets [Member] | May 02, 2013 Big Country [Member] Accrued Liabilities [Member] | May 02, 2013 Big Country [Member] Long-term Debt [Member] | May 02, 2013 Big Country [Member] Deferred Income Tax Charges [Member] | May 02, 2013 Big Country [Member] Earn-out Arrangements [Member] | Dec. 02, 2012 Bottom Line Services [Member] | Dec. 02, 2012 Bottom Line Services [Member] Trade Names [Member] | Dec. 02, 2012 Bottom Line Services [Member] Noncompete Agreements [Member] | Dec. 02, 2012 Bottom Line Services [Member] Customer Relationships [Member] | Dec. 02, 2012 Bottom Line Services [Member] Other Current Assets [Member] | Dec. 02, 2012 Bottom Line Services [Member] Accrued Liabilities [Member] | Dec. 02, 2012 Bottom Line Services [Member] Earn-out Arrangements [Member]
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Purchase price consideration: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition payments in cash |  |  |  |  | $ 103,500,000 |  |  |  |  |  |  |  |  |  | $ 67,600,000 |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,800,000 |  |  |  |  |  |  | 11,100,000
Total consideration transferred |  |  |  |  | 126,300,000 |  |  |  |  |  |  |  |  |  | 78,700,000 |  |  |  |  |  |
Purchase price allocation to identifiable assets acquired and liabilities assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  | 69,000,000 |  |  |  |  |  |  |  |  | 36,300,000 |  |
Property and equipment |  |  |  |  | 42,600,000 |  |  |  |  |  |  |  |  |  | 12,600,000 |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 10,100,000 | 1,800,000 | 6,500,000 | 29,600,000 |  |  |  |  |  |  | 2,600,000 | 500,000 | 24,400,000 |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  | (21,900,000) | (24,400,000) | (10,100,000) |  |  |  |  |  |  | (12,800,000) |
Total identifiable net assets |  |  |  |  | 94,900,000 |  |  |  |  |  |  |  |  |  | 63,600,000 |  |  |  |  |  |
Goodwill | 860,207,000 | 826,110,000 | 718,300,000 | 714,800,000 | 31,400,000 |  |  |  |  |  |  |  |  |  | 15,100,000 |  |  |  |  |  |
Total consideration allocated |  |  |  |  | $ 126,300,000 |  |  |  |  |  |  |  |  |  | $ 78,700,000 |  |  |  |  |  |

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- Definition Net amount recognized for aggregate assets, including goodwill, in excess of or less than the aggregate liabilities assumed (also referred to as net assets acquired). This amount may also be viewed as incremental amount of equity that the consolidated entity (including the portion attributable to a noncontrolling interest) will recognize as a result of the business combination. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -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 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -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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