Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summarized Financial Information (Detail)

v3.2.0.727
Segment Information - Summarized Financial Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenues $ 1,872,340 $ 1,838,209 $ 3,733,726 $ 3,573,657
Operating income (loss) 68,851 120,797 153,001 200,129
Depreciation 41,030 33,907 80,428 66,754
Electric Power Infrastructure [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,222,324 1,252,842 2,462,616 2,542,433
Operating income (loss) 88,027 112,836 197,019 257,324
Depreciation 22,072 18,627 42,989 36,490
Oil and Gas Infrastructure Services [Member]        
Segment Reporting Information [Line Items]        
Revenues 650,016 585,367 1,271,110 1,031,224
Operating income (loss) 35,981 55,583 60,128 34,411
Depreciation 16,783 13,465 33,252 26,680
Corporate and Non-Allocated Costs [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) (55,157) (47,622) (104,146) (91,606)
Depreciation $ 2,175 $ 1,815 $ 4,187 $ 3,584