Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summarized Financial Information (Detail)

v3.7.0.1
Segment Information - Summarized Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenues $ 2,200,374 $ 1,792,430 $ 4,378,544 $ 3,506,167
Operating income (loss) 109,791 35,469 184,865 72,763
Depreciation 44,650 42,759 87,343 83,929
Electric Power Infrastructure Services        
Segment Reporting Information [Line Items]        
Revenues 1,300,729 1,159,087 2,520,231 2,346,089
Operating income (loss) 113,043 75,934 212,715 163,258
Depreciation 22,150 22,937 44,236 45,882
Oil and Gas Infrastructure Services        
Segment Reporting Information [Line Items]        
Revenues 899,645 633,343 1,858,313 1,160,078
Operating income (loss) 67,751 11,899 106,568 17,740
Depreciation 18,134 17,254 35,498 33,055
Corporate and non-allocated costs        
Segment Reporting Information [Line Items]        
Operating income (loss) (71,003) (52,364) (134,418) (108,235)
Depreciation $ 4,366 $ 2,568 $ 7,609 $ 4,992