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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.