Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Investments in Affiliates and Other Entities) - Additional Information (Detail)

v3.7.0.1
Summary of Significant Accounting Policies (Investments in Affiliates and Other Entities) - Additional Information (Detail) - Partnership [Member]
$ in Millions
Mar. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]  
Capital to be provided with select investors of infrastructure projects $ 750
Quanta Services Inc [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Capital to be provided with select investors of infrastructure projects $ 60