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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - Acquisitions 2016 [Member] - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Value of Quanta common stock issued |  | $ 1,508
Cash paid or payable |  | 75,941
Contingent consideration |  | 18,683
Fair value of total consideration transferred or estimated to be transferred |  | 96,132
Current assets |  | 24,233
Property and equipment |  | 44,863
Other assets |  | 2,553
Identifiable intangible assets | $ 3,100 | 11,467
Current liabilities |  | (12,477)
Deferred tax liabilities, net |  | (13,708)
Other long-term liabilities |  | (5,326)
Total identifiable net assets |  | 51,605
Goodwill | $ 18,400 | 44,527
Fair value of total consideration transferred |  | $ 96,132

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + 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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: 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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- 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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