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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2011
Short term investments |  |  |
Term of certificates of deposits, minimum | 4 months |  |
Term of certificates of deposits, maximum | 6 months |  |
Goodwill and other intangible assets |  |  |
Impairment charge |  | $ 1,732 |
Goodwill and other intangible assets |  |  |
Goodwill | 116,941 |  | 94,179
East Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 69,859 |  | 59,659
West Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 44,641 |  | 32,079
Engineering |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 2,441 |  | 2,441
James Construction Group | East Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 59,259 |  |
Rockford | West Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 32,079 |  |
Q3C Contracting, Inc | West Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 12,562 |  |
Sprint | East Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 9,389 |  |
Born Canada | Engineering |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 2,441 |  |
Saxon Group | East Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | 810 |  |
Cardinal Contractors | East Construction Services |  |  |
Goodwill and other intangible assets |  |  |
Goodwill | $ 401 |  |

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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of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 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 5: 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. Reference 6: 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 7: 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 8: 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. + Details
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