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Acquisitions - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Entity | Mar. 31, 2015 Entity | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Entity | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) Entity shares
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid for acquisitions |  |  |  | $ 64,700 |  | $ 279,500
Aggregate consideration paid or payable for acquisitions |  |  |  | $ 65,700 |  |
Number of business acquisitions | Entity | 3 | 3 |  | 6 |  | 9
Number of shares granted for acquired companies | shares |  |  |  |  |  | 686,382
Value of equity interests transferred |  |  |  |  |  | $ 134,500
Goodwill acquired |  |  |  | $ 30,310 |  |
Fair value of accounts receivable acquired | $ 10,300 |  |  | 10,300 |  | 117,200
Goodwill expected to be deductible for income tax | 10,600 |  |  | 10,600 |  | 43,500
Income (loss) from continuing operations before income taxes | 67,047 |  | $ 119,035 | 150,038 | $ 199,571 |
Third and Fourth Quarter 2014 [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net tangible assets acquired |  |  |  |  |  | 111,000
Goodwill acquired |  |  |  |  |  | 107,300
Other intangible assets, acquired |  |  |  |  |  | $ 73,900
Two Thousand Fifteen Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net tangible assets acquired |  |  |  | 20,600 |  |
Goodwill acquired |  |  |  | 30,300 |  |
Other intangible assets, acquired | 14,800 |  |  | 14,800 |  |
Contributed by Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues | 18,100 |  |  | 25,100 |  |
Income (loss) from continuing operations before income taxes | (300) |  |  | (1,200) |  |
Acquisition costs | $ 1,300 |  |  | $ 1,700 |  |
Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares granted for acquired companies | shares |  |  |  |  |  | 3,825,971
Series G Preferred Stock [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares granted for acquired companies | shares |  |  |  |  |  | 1
Series G Preferred Stock [Member] | Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares granted for acquired companies | shares |  |  |  |  |  | 899,858
Electric Power Infrastructure Services Business [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity |  |  |  | 4 |  |
Electric Power Infrastructure Services Business [Member] | United States [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity | 2 |  |  | 2 |  | 1
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity | 1 | 1 |  | 2 |  | 4
Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity |  |  |  |  |  | 1
Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity |  |  |  |  |  | 1
Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity |  | 1 |  | 1 |  | 2
Oil and Gas Infrastructure Services Business [Member] | Australia [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of business acquisitions | Entity |  | 1 |  | 1 |  |
Electric Power Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 13,509 |  | $ 72,300
Oil and Gas Infrastructure Division [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 16,801 |  | $ 94,100

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