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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended | 3 Months Ended
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Jun. 30, 2012 Entity | Dec. 31, 2011 Entity | Dec. 31, 2013 Entity | Dec. 31, 2012 Entity | Dec. 31, 2011 Entity | Mar. 31, 2014 Subsequent Event [Member] Entity | Mar. 31, 2014 Series G Preferred Stock [Member] Subsequent Event [Member] | Mar. 31, 2014 Canada [Member] Electric Power Infrastructure Services Business [Member] Subsequent Event [Member] Entity | Mar. 31, 2014 United States [Member] General Engineering And Construction Company [Member] Subsequent Event [Member] Entity | Mar. 31, 2014 Canadian Subsidiaries [Member] Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Number of business acquisitions | 4 | 5 | 6 | 4 | 5 | 5 |  | 4 | 1 |
Cash paid for acquisition |  |  | $ 341,100 |  |  | $ 79,900 |  |  |  |
Number of shares issued for acquisition of company | 1,927,113 | 1,939,813 | 3,547,482 | 1,927,113 | 1,939,813 | 393,051 | 1 |  |  | 899,858
Common stock value | $ 37,291 | $ 32,400 | $ 88,895 | $ 37,291 | $ 32,400 | $ 36,600 |  |  |  |

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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 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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