Accrued Mining and Landfill Reclamation - Activity for Asset Retirement Obligations (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 27, 2014 |
Dec. 28, 2013 |
|
| Asset Retirement Obligation Disclosure [Abstract] | ||
| Beginning balance | $ 15,781 | $ 14,844 |
| Acquired obligations | 140 | 286 |
| Change in cost estimate | 2,233 | 721 |
| Settlement of reclamation obligations | (1,178) | (1,201) |
| Additional liabilities incurred | 463 | 414 |
| Accretion expense | 871 | 717 |
| Ending balance | $ 18,310 | $ 15,781 |