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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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