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Acquisitions - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2013 Entity | Sep. 30, 2013 | Jun. 30, 2012 Entity | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions completed | 2 |  | 4 |  |  |
Cash paid for acquisitions, net of cash acquired | $ 123,800,000 | $ 123,759,000 |  | $ 124,736,000 | $ 68,727,000 |
Number of shares issued for acquisition of company | 763,272 |  | 1,927,113 |  |  |
Common stock value | 18,700,000 |  | 37,300,000 |  |  |
Cash paid for acquisition |  |  | 57,500,000 |  |  |
Payment of cash to repay acquiree debt |  |  | 11,000,000 |  |  |
Accounts receivables with fair value |  | 38,200,000 |  | 38,200,000 |  | 15,300,000
Goodwill |  | 1,650,012,000 |  | 1,650,012,000 |  | 1,537,645,000
Revenues contributed by acquisitions |  | 83,500,000 |  | 83,500,000 |  |
Income before income taxes contributed by acquisitions |  | 4,300,000 |  | 4,300,000 |  |
Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill expected to be deductible for income tax |  | 75,700,000 |  | 75,700,000 |  | 52,900,000
Electric Power Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 1,137,207,000 |  | 1,137,207,000 |  | 1,065,152,000
Electric Power Division [Member] | United States [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions completed | 1 |  | 2 |  |  |
Electric Power Division [Member] | Canada [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions completed |  |  | 1 |  |  |
Electric Power Division [Member] | Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 76,800,000 |  | 76,800,000 |  | 57,500,000
Natural Gas and Pipeline Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 178,015,000 |  | 178,015,000 |  | 137,703,000
Natural Gas and Pipeline Division [Member] | Australia [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions completed | 1 |  |  |  |  |
Natural Gas and Pipeline Division [Member] | United States [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions completed |  |  | 1 |  |  |
Natural Gas and Pipeline Division [Member] | Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 41,100,000 |  | $ 41,100,000 |  | $ 7,300,000

X
- 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 after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + 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 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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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + 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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