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Equity (Non-controlling Interests) - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Noncontrolling Interest [Abstract]      
Income attributable to the other joint venture members $ 400,000 $ 4,700,000  
Carrying value of the investments held by Quanta in variable interest entities 2,700,000   $ 2,300,000
Non-controlling interests 2,684,000   $ 2,321,000
Distributions to non-controlling interests $ 0 $ 2,500,000