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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Revenue recognition |  |  |
Reimbursable expenses | $ 37,320 | $ 33,530 | $ 39,722
Revenues | Fixed-price engagements |  |  |
Revenue recognition |  |  |
Percentage of consolidated revenues | 13.00% | 15.00% | 22.00%
Minimum |  |  |
Revenue recognition |  |  |
Period in which engagements are generally completed | 3 months |  |
Maximum |  |  |
Revenue recognition |  |  |
Period in which engagements are generally completed | 6 months |  |

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