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Acquisitions - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 Entity | Dec. 31, 2011 Entity | Dec. 31, 2013 Entity | Dec. 31, 2012 Entity | Dec. 31, 2011 Entity
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquisitions completed | 4 | 5 | 6 | 4 | 5
Number of shares issued for acquisition of company | 1,927,113 | 1,939,813 | 3,547,482 | 1,927,113 | 1,939,813
Common stock value | $ 37,291,000 | $ 32,400,000 | $ 88,895,000 | $ 37,291,000 | $ 32,400,000
Cash paid for acquisition |  |  | 341,100,000 |  |
Cash paid for acquisition | 57,500,000 | 80,800,000 |  | 57,500,000 | 80,800,000
Payment of cash to repay acquiree debt | 11,000,000 | 3,400,000 |  | 11,000,000 | 3,400,000
Accounts receivables with fair value | 15,300,000 |  | 83,900,000 |  |
Goodwill acquired |  |  | 255,806,000 | 64,779,000 |
Revenues contributed by acquisitions |  |  | 251,300,000 | 125,700,000 | 43,800,000
Income before income taxes contributed by acquisitions |  |  | 18,200,000 | 6,200,000 | 4,400,000
Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill expected to be deductible for income tax | 52,900,000 |  | 213,600,000 |  |
Electric Power Division [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  | 112,549,000 | 57,451,000 |
Electric Power Division [Member] | Canada [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquisitions completed | 1 | 3 |  |  | 3
Electric Power Division [Member] | United States [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquisitions completed | 2 | 1 |  |  | 1
Electric Power Division [Member] | Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  | 112,500,000 | 57,500,000 |
Oil and Gas Infrastructure Division [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  | 143,257,000 | 7,328,000 |
Oil and Gas Infrastructure Division [Member] | United States [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquisitions completed | 1 |  |  |  |
Oil and Gas Infrastructure Division [Member] | Australia [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of business acquisitions completed |  | 1 |  |  | 1
Oil and Gas Infrastructure Division [Member] | Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  | $ 143,300,000 | $ 7,300,000 |

X
- Definition Aggregate business acquisition cost of acquired entity cash paid and liabilities incurred. + References No definition available. + Details
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- Definition Aggregate amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References No definition available. + Details
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- Definition Income 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 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 cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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