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Equity (Non-controlling Interests) - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Noncontrolling Interest [Line Items]      
Income attributable to the other joint venture members $ 1,700 $ 10,900 $ 18,400
Carrying value of the investments held by Quanta in variable interest entities 3,300 2,300  
Non-controlling interests 3,275 2,321  
Distributions to non-controlling interests $ 761 21,228 $ 14,432
Contributions received from a joint venture partner   2,313  
Corporate Joint Venture [Member]      
Noncontrolling Interest [Line Items]      
Contributions received from a joint venture partner   $ 2,300