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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of accounts receivable acquired | $ 14,400 | $ 20,600 |  | $ 14,400 |  | $ 20,600
Goodwill acquired |  |  |  | 44,610 |  | 51,935
Income (loss) from continuing operations before income taxes | 128,063 |  | $ 78,133 | 193,789 | $ 228,171 |
Electric Power Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | 24,074 |  |
Oil and Gas Infrastructure Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | 20,536 |  |
Acquisitions 2016 [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | 44,600 |  |
Goodwill expected to be deductible for income tax | 2,000 |  |  | 2,000 |  |
Revenues | 24,600 |  |  | 49,100 |  |
Income (loss) from continuing operations before income taxes | $ (700) |  |  | (1,600) |  |
Acquisitions 2016 [Member] | Electric Power Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | 24,100 |  |
Acquisitions 2016 [Member] | Oil and Gas Infrastructure Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 20,500 |  |
Acquisitions 2015 [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  | 4,400 |  |  |  |
Goodwill expected to be deductible for income tax |  | $ 34,000 |  |  |  | 34,000
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

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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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