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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

X

- Definition

Aggregate business acquisition consideration of acquired entity cash paid and liabilities incurred during period.

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Amount of tangible assets acquired less liabilities assumed at the acquisition date.

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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))

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Number of shares of equity interests issued or issuable to acquire entity.

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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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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.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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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.

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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.

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The number of businesses acquired by the entity during the period.

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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).

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