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Operations in Different Geographic Areas (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Operations in Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net |  | $ 46,103 |  |  |  | $ 35,014 |  |  |  | $ 46,103 |  | $ 35,014 |  |  |
Revenues |  | 92,143 | $ 95,302 | $ 95,621 | $ 96,457 | 88,282 | $ 87,555 | $ 87,840 | $ 84,122 | 379,523 | [1] | 347,799 | [1] | $ 315,076 | [1]
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations in Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net |  | 44,181 |  |  |  | 33,771 |  |  |  | 44,181 |  | 33,771 |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 334,422 |  | 308,406 |  | 281,223 |
Foreign Countries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations in Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net |  | $ 1,922 |  |  |  | $ 1,243 |  |  |  | 1,922 |  | 1,243 |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | $ 45,101 |  | $ 39,393 |  | $ 33,853 |
[1] | Geographic revenues are allocated based on the location of the client.

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