Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands |
Mar. 28, 2015 |
Dec. 27, 2014 |
Dec. 28, 2013 |
|---|---|---|---|
| Inventory Disclosure [Abstract] | |||
| Aggregate stockpiles | $ 90,000 | $ 88,211 | $ 70,300 |
| Finished goods | 18,355 | 8,826 | 11,207 |
| Work in process | 2,065 | 1,801 | 2,623 |
| Raw materials | 22,887 | 12,715 | 12,302 |
| Total | $ 133,307 | $ 111,553 | $ 96,432 |