Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Property, Plant and Equipment [Line Items] | |||
| Construction in progress | $ 1,200 | $ 1,900 | |
| Depreciation expense included in operating expense | 27,200 | 31,873 | $ 34,436 |
| Impairment of PP&E held for sale | 3,791 | 0 | 0 |
| Oil & Gas and Utility T&D Segments | |||
| Property, Plant and Equipment [Line Items] | |||
| Impairment of PP&E held for sale | 3,300 | ||
| Operating Expense | |||
| Property, Plant and Equipment [Line Items] | |||
| Depreciation expense included in operating expense | $ 17,300 | $ 22,000 | $ 24,500 |