Summary of Organization and Significant Accounting Policies - Schedule of Contingent Consideration Obligations Measured at Fair Value (Detail) - USD ($) $ in Thousands |
Mar. 28, 2015 |
Dec. 27, 2014 |
Dec. 28, 2013 |
|---|---|---|---|
| Accounting Policies [Abstract] | |||
| Current portion of contingent consideration | $ 3,775 | $ 2,375 | |
| Contingent consideration | $ 4,187 | $ 5,379 | $ 1,908 |