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Summary of Gross Revenues and Reimbursements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Gross Revenues And Reimbursements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  | $ 373,840 |  | $ 322,293 |  | $ 320,404 |
Less: Subcontractor fees |  |  |  |  |  |  |  |  | 26,041 |  | 7,217 |  | 7,572 |
Revenues | $ 88,282 | $ 87,555 | $ 87,840 | $ 84,122 | $ 77,013 | $ 77,612 | $ 77,295 | $ 83,156 | 347,799 | [1] | 315,076 | [1] | 312,832 | [1]
Reimbursements: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Out-of-pocket reimbursements |  |  |  |  |  |  |  |  | 7,693 |  | 5,474 |  | 5,967 |
Other outside direct expenses |  |  |  |  |  |  |  |  | 10,442 |  | 10,405 |  | 11,160 |
Reimbursements |  |  |  |  |  |  |  |  | 18,135 |  | 15,879 |  | 17,127 |
Revenues before reimbursements | $ 82,718 | $ 82,359 | $ 84,120 | $ 80,467 | $ 72,753 | $ 74,160 | $ 73,334 | $ 78,950 | $ 329,664 |  | $ 299,197 |  | $ 295,705 |
[1] | Geographic revenues are allocated based on the location of the client.

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