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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |
Goodwill balance | $ 1,537,645 | $ 1,470,811
Goodwill acquired | 255,806 | 64,779
Foreign currency translation related to goodwill | (12,734) | 2,055
Goodwill balance | 1,780,717 | 1,537,645
Electric Power Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 1,065,152 | 988,702
Goodwill acquired | 112,549 | 57,451
Foreign currency translation related to goodwill | (9,617) | 2,087
Operating unit reorganization |  | 16,912
Goodwill balance | 1,168,084 | 1,065,152
Oil and Gas Infrastructure Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 137,703 | 113,598
Goodwill acquired | 143,257 | 7,328
Foreign currency translation related to goodwill | (3,117) | (32)
Operating unit reorganization |  | 16,809
Goodwill balance | 277,843 | 137,703
Fiber Optic Licensing Division[Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 334,790 | 368,511
Goodwill acquired |  |
Foreign currency translation related to goodwill |  |
Operating unit reorganization |  | (33,721)
Goodwill balance | $ 334,790 | $ 334,790

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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 Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of other (increase) decrease of an asset representing the 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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