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Acquisitions (Narrative) (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 6 Months Ended | 9 Months Ended |
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Sep. 30, 2012 | Mar. 31, 2012 Entity | Sep. 30, 2011 Entity | Sep. 30, 2012 | Dec. 31, 2011 Entity | Sep. 30, 2012 Electric Power Division [Member] | Dec. 31, 2011 Electric Power Division [Member] | Mar. 31, 2012 Electric Power Division [Member] Canada [Member] Entity | Sep. 30, 2011 Electric Power Division [Member] Canada [Member] Entity | Dec. 31, 2011 Electric Power Division [Member] Canada [Member] Entity | Jun. 30, 2012 Electric Power Division [Member] United States [Member] Entity | Mar. 31, 2012 Electric Power Division [Member] United States [Member] Entity | Dec. 31, 2011 Electric Power Division [Member] United States [Member] Entity | Sep. 30, 2012 Natural Gas And Pipeline Division [Member] | Dec. 31, 2011 Natural Gas And Pipeline Division [Member] | Mar. 31, 2012 Natural Gas And Pipeline Division [Member] United States [Member] Entity | Sep. 30, 2011 Natural Gas And Pipeline Division [Member] Australia [Member] Entity | Dec. 31, 2011 Natural Gas And Pipeline Division [Member] Australia [Member] Entity | Sep. 30, 2012 Service Electric [Member] | Apr. 12, 2012 Service Electric [Member] | Sep. 30, 2012 Crux [Member] | Jan. 09, 2012 Crux [Member] | Sep. 30, 2012 Microline [Member] | Jan. 04, 2012 Microline [Member] | Dec. 31, 2011 Third and fourth quarters 2011 acquisitions | Sep. 30, 2012 Phasor [Member] | Mar. 02, 2012 Phasor [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,300,000 |  | $ 27,500,000 |  | $ 6,800,000 | $ 80,800,000 |  | $ 2,900,000
Number of shares issued for acquisition of company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 662,426 |  | 856,105 |  | 320,619 |  | 1,939,813 | 87,963 |
Common stock value | 37,291,000 |  |  | 37,291,000 | 32,368,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,500,000 |  | 16,700,000 |  | 6,400,000 | 32,400,000 |  | 1,700,000
Payment of cash to repay acquiree debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000 |  | 4,200,000 |  | 900,000 | 3,400,000 |  |
Number of business acquisitions completed |  | 3 | 4 |  | 5 |  |  | 1 | 3 | 3 | 1 | 1 | 1 |  |  | 1 | 1 | 1 |  |  |  |  |  |  |  |  |
Accounts receivables with fair value | 15,300,000 |  |  | 15,300,000 | 16,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 64,779,000 |  |  | 64,779,000 | 43,758,000 | 57,500,000 | 34,900,000 |  |  |  |  |  |  | 7,300,000 | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax | 52,900,000 |  |  | 52,900,000 | 13,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues contributed by acquisitions | 35,500,000 |  |  | 60,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes contributed by acquisitions | $ (700,000) |  |  | $ (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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