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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 Entity | Mar. 31, 2014 Entity | Jun. 30, 2014 Entity | Dec. 31, 2013 Entity
Business Acquisition [Line Items] |  |  |  |
Number of business acquisitions | 1 | 5 | 6 | 6
Cash paid for acquisitions |  |  | $ 83,200,000 | $ 341,100,000
Number of shares granted for acquired company |  |  | 459,392 | 3,547,482
Common stock value |  |  | 38,641,000 | 88,895,000
Fair value of accounts receivable acquired | 31,200,000 |  | 31,200,000 | 83,900,000
Goodwill acquired |  |  | 58,344,000 |
Revenues contributed by acquisitions | 47,600,000 |  | 84,600,000 |
Income (loss) before income taxes contributed by acquisitions | (2,200,000) |  | (2,300,000) |
Acquisition costs |  |  | 4,300,000 |
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of business acquisitions |  |  | 4 |
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] | United States [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of business acquisitions |  |  | 1 |
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 Division [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  |  | 50,788,000 |
Electric Power Division [Member] | Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  |  | 50,800,000 | 112,500,000
Oil and Gas Infrastructure Division [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  |  | 7,556,000 |
Oil and Gas Infrastructure Division [Member] | Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  |  | $ 7,600,000 | $ 143,300,000
Exchangeable Shares [Member] | Canadian Subsidiaries [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shares granted for acquired company |  |  | 899,858 |
Series G Preferred Stock [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shares granted for acquired company |  |  | 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 Income (loss) before income taxes contributed by acquisitions. + References No definition available. + Details
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- Definition Revenues contributed by acquisitions. + 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=7488404&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=7488404&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=6910749&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 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=14024403&loc=d3e13816-109267 + 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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