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Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 Entity | Dec. 31, 2011 Entity | Dec. 31, 2010 | Dec. 31, 2012 Electric Power Division [Member] | Dec. 31, 2011 Electric Power Division [Member] | Dec. 31, 2012 Electric Power Division [Member] Canada [Member] Entity | Dec. 31, 2011 Electric Power Division [Member] Canada [Member] Entity | Dec. 31, 2012 Electric Power Division [Member] United States [Member] Entity | Dec. 31, 2011 Electric Power Division [Member] United States [Member] Entity | Dec. 31, 2012 Natural Gas and Pipeline Division [Member] | Dec. 31, 2011 Natural Gas and Pipeline Division [Member] | Dec. 31, 2012 Natural Gas and Pipeline Division [Member] United States [Member] Entity | Dec. 31, 2011 Natural Gas and Pipeline Division [Member] Australia [Member] Entity | Oct. 25, 2010 Common Stock and Exchangeable Shares [Member] | Oct. 31, 2010 Valard Construction LP [Member] | Oct. 25, 2010 Valard Construction LP [Member] | Oct. 31, 2010 Valard Construction LP [Member] Exchangeable Shares [Member] | Dec. 31, 2012 First and Second Quarters of 2012 acquisitions [Member] | Dec. 31, 2011 Third and Fourth Quarters of 2011 acquisitions [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business acquisitions completed | 4 | 5 |  |  |  | 1 | 3 | 2 | 1 |  |  | 1 | 1 |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 118,900,000 |  | $ 57,500,000 | $ 80,800,000
Number of shares issued for acquisition of company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 623,720 |  | 3,909,110 | 1,927,113 | 1,939,813
Common stock value |  |  |  |  |  |  |  |  |  |  |  |  |  | 83,400,000 |  |  |  | 37,291,000 | 32,368,000
Payment of cash to repay acquire debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,800,000 |  | 11,000,000 | 3,400,000
Accounts receivables with fair value | 15,300,000 | 16,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 57,500,000 | 34,900,000 |  |  |  |  | 7,300,000 | 8,900,000 |  |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax | 52,900,000 | 13,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues contributed by acquisitions | 125,700,000 | 43,800,000 | 25,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes contributed by acquisitions | $ 6,200,000 | $ 4,400,000 | $ 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -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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- Definition The amount of acquisition cost of a business combination allocated to receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph b -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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