Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summarized Financial Information (Detail)

v3.10.0.1
Segment Information - Summarized Financial Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Revenues $ 2,656,348 $ 2,200,374 $ 5,073,924 $ 4,378,544
Operating income (loss) 123,039 109,791 198,260 184,865
Depreciation 50,034 44,650 98,753 87,343
Electric Power Infrastructure Services        
Segment Reporting Information [Line Items]        
Revenues 1,570,173 1,300,729 3,138,680 2,520,231
Operating income (loss) 146,011 113,043 286,906 212,715
Depreciation 23,258 22,150 47,528 44,236
Oil and Gas Infrastructure Services        
Segment Reporting Information [Line Items]        
Revenues 1,086,175 899,645 1,935,244 1,858,313
Operating income (loss) 43,829 67,751 53,886 106,568
Depreciation 22,480 18,134 43,175 35,498
Corporate and non-allocated costs        
Segment Reporting Information [Line Items]        
Operating income (loss) (66,801) (71,003) (142,532) (134,418)
Depreciation $ 4,296 $ 4,366 $ 8,050 $ 7,609