Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summarized Financial Information (Detail)

v2.4.0.8
Segment Information - Summarized Financial Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenues $ 1,864,550 $ 1,474,377 $ 3,627,124 $ 3,060,087
Operating income (loss) 133,393 117,174 223,888 236,465
Depreciation 37,996 33,040 74,861 64,920
Electric Power Infrastructure [Member]
       
Segment Reporting Information [Line Items]        
Revenues 1,239,168 1,046,379 2,517,336 2,227,362
Operating income (loss) 112,069 120,809 256,481 253,359
Depreciation 18,271 15,776 35,835 30,699
Oil And Gas Infrastructure Services [Member]
       
Segment Reporting Information [Line Items]        
Revenues 585,367 385,942 1,031,224 744,874
Operating income (loss) 55,583 27,644 34,411 38,001
Depreciation 13,465 11,335 26,680 22,600
Fiber Optic Licensing and Other [Member]
       
Segment Reporting Information [Line Items]        
Revenues 40,015 42,056 78,564 87,851
Operating income (loss) 14,146 14,301 26,255 31,184
Depreciation 4,445 4,230 8,763 8,281
Corporate and Non-Allocated Costs [Member]
       
Segment Reporting Information [Line Items]        
Operating income (loss) (48,405) (45,580) (93,259) (86,079)
Depreciation $ 1,815 $ 1,699 $ 3,583 $ 3,340