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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 Entity | Jun. 30, 2014 Entity | Mar. 31, 2014 Entity | Sep. 30, 2013 | Sep. 30, 2014 Entity | Sep. 30, 2013 | Dec. 31, 2013 Entity
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions | 2 | 1 | 5 |  | 8 |  | 6
Cash paid for acquisitions |  |  |  |  | $ 171,500,000 |  | $ 341,100,000
Number of shares granted for acquired companies |  |  |  |  | 686,382 |  | 3,547,482
Common stock value |  |  |  |  | 70,200,000 |  | 88,900,000
Goodwill acquired |  |  |  |  | 109,072,000 |  |
Fair value of accounts receivable acquired | 69,000,000 |  |  |  | 69,000,000 |  | 83,900,000
Income (Loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest | 142,115,000 |  |  | 140,918,000 | 365,447,000 | 376,603,000 |
Acquisition costs |  |  |  |  | 5,400,000 |  |
Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax | 11,300,000 |  |  |  | 11,300,000 |  | 213,600,000
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions |  |  |  |  | 4 |  |
Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions |  |  |  |  | 1 |  |
Electric Power Infrastructure Services Business [Member] | United States [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions |  |  |  |  | 1 |  |
Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions |  |  |  |  | 1 |  |
Oil and Gas Infrastructure Services Business [Member] | California [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions |  |  |  |  | 1 |  |
Third Quarter Two Thousand Fourteen Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net tangible assets acquired | 40,200,000 |  |  |  |  |  |
Goodwill acquired | 50,700,000 |  |  |  |  |  |
Other intangible assets, acquired | 28,800,000 |  |  |  | 28,800,000 |  |
Contributed by Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues | 98,900,000 |  |  |  | 183,500,000 |  |
Income (Loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest | 6,300,000 |  |  |  | 4,100,000 |  |
Exchangeable Shares [Member] | Canadian Subsidiaries [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of shares granted for acquired companies |  |  |  |  | 1,721,377 |  |
Exchangeable Shares [Member] | Canadian Subsidiaries [Member] | Additional shares of common stock [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of shares granted for acquired companies |  |  |  |  | 899,858 |  |
Electric Power Division [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 71,517,000 |  |
Electric Power Division [Member] | Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 71,500,000 |  | 112,500,000
Oil and Gas Infrastructure Division [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 37,555,000 |  |
Oil and Gas Infrastructure Division [Member] | Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 37,600,000 |  | $ 143,300,000
Series G Preferred Stock [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of shares granted for acquired companies |  |  |  |  | 1 |  |

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- Definition Aggregate business acquisition consideration of acquired entity cash paid and liabilities incurred during period. + References No definition available. + Details
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- Definition Amount of tangible assets acquired less liabilities assumed at the acquisition date. + References No definition available. + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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