Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail)

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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
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