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Equity - Non-controlling Interests (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Equity [Abstract]          
Net income attributable to non-controlling interests $ 536 $ 410 $ 1,232 $ 940  
Carrying value of the investments held by Quanta in variable interest entities 2,700   2,700   $ 3,300
Non-controlling interests 2,701   2,701   $ 3,275
Distributions to non-controlling interests $ 400 $ 600 $ 1,800 $ 600