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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

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