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Operations in Different Geographic Areas (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
Operations in Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net |  | $ 35,014 |  |  |  | $ 36,710 |  |  |  | $ 35,014 |  | $ 36,710 |  |  |
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]
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations in Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net |  | 33,771 |  |  |  | 35,746 |  |  |  | 33,771 |  | 35,746 |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | 308,406 |  | 281,223 |  | 281,618 |
Foreign Countries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations in Different Geographic Areas [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Equipment and Leasehold Improvements, net |  | $ 1,243 |  |  |  | $ 964 |  |  |  | 1,243 |  | 964 |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | $ 39,393 |  | $ 33,853 |  | $ 31,214 |
[1] | Geographic revenues are allocated based on the location of the client.

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