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Equity (Non-controlling Interests) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Noncontrolling Interest [Abstract]          
Income attributable to the other joint venture members $ 400 $ 2,600 $ 900 $ 10,700  
Carrying value of the investments held by Quanta in variable interest entities 2,600   2,600   $ 2,300
Non-controlling interests 2,649   2,649   $ 2,321
Distributions to non-controlling interests $ 600 $ 1,500 $ 600 $ 6,500