Retirement Plans and Benefits (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Multiemployer Plans [Line Items] | |||
| Contributions | $ 1,337 | $ 8,255 | $ 1,674 |
| Boilermaker-Blacksmith National Pension Trust | |||
| Multiemployer Plans [Line Items] | |||
| EIN/PN | 48-6168020/ 001 | ||
| PPA Zone Status | Yellow | ||
| Plan Year End for Zone Status | Dec. 31, 2015 | ||
| Subject to Funding Improvement/ Rehabilitation Plan | Implemented | ||
| Contributions | $ 208 | 1,009 | 380 |
| Sur-charge Impose | No | ||
| Expiration Date of Collective Bargaining Agreement | Oct. 31, 2017 | ||
| Pennsylvania Heavy and Highway Contractors Pension Trust | |||
| Multiemployer Plans [Line Items] | |||
| EIN/PN | 23-6531755/ 001 | ||
| PPA Zone Status | Green | ||
| Plan Year End for Zone Status | Dec. 31, 2014 | ||
| Subject to Funding Improvement/ Rehabilitation Plan | No | ||
| Contributions | $ 1,086 | 7,210 | 1,171 |
| Sur-charge Impose | No | ||
| Expiration Date of Collective Bargaining Agreement | May 31, 2016 | ||
| Other Funds | |||
| Multiemployer Plans [Line Items] | |||
| Contributions | $ 43 | $ 36 | $ 123 |