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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Fair value of accounts receivable acquired | $ 14,400 | $ 20,600 |
Goodwill acquired | 45,186 | 51,860 |
Income (loss) from continuing operations before income taxes | 307,686 | 228,675 | $ 426,599
Electric Power Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | 24,168 | 31,224 |
Oil and Gas Infrastructure Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | 21,018 | 20,636 |
Acquisitions 2016 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | 45,200 |  |
Goodwill expected to be deductible for income tax | 2,000 |  |
Revenues | 68,500 |  |
Income (loss) from continuing operations before income taxes | (5,600) |  |
Acquisition costs | 300 |  |
Acquisitions 2016 [Member] | Electric Power Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | 24,200 |  |
Acquisitions 2016 [Member] | Oil and Gas Infrastructure Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | $ 21,000 |  |
Acquisitions 2015 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill expected to be deductible for income tax |  | 34,000 |
Revenues |  | 104,600 |
Income (loss) from continuing operations before income taxes |  | 300 |
Acquisition costs |  | 3,600 |
Acquisitions 2015 [Member] | Electric Power Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  | 31,500 |
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  | $ 20,400 |
Acquisitions 2014 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenues |  |  | 314,100
Income (loss) from continuing operations before income taxes |  |  | 3,400
Acquisition costs |  |  | 11,600
Acquisitions 2014 [Member] | Electric Power Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  |  | 72,300
Acquisitions 2014 [Member] | Oil and Gas Infrastructure Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  |  | $ 94,100

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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=50486907&loc=d3e511914-122862 Reference 2: 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)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + 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=73530397&loc=d3e4845-128472 + Details
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