Operations in Different Geographic Areas (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Oct. 03, 2014	Jul. 04, 2014	Apr. 04, 2014	Jan. 01, 2016		Jan. 02, 2015		Jan. 03, 2014
Operations in Different Geographic Areas [Line Items]
Property, Equipment and Leasehold Improvements, net		$ 28,485				$ 28,264				$ 28,485		$ 28,264
Revenues		73,681	$ 78,994	$ 79,864	$ 80,293	73,611	$ 78,557	$ 76,574	$ 75,962	312,832	[1]	304,704	[1]	$ 296,168	[1]
United States
Operations in Different Geographic Areas [Line Items]
Property, Equipment and Leasehold Improvements, net		27,775				27,761				27,775		27,761
Revenues	[1]									281,618		273,635		263,341
Foreign Countries
Operations in Different Geographic Areas [Line Items]
Property, Equipment and Leasehold Improvements, net		$ 710				$ 503				710		503
Revenues	[1]									$ 31,214		$ 31,069		$ 32,827

[1] Geographic revenues are allocated based on the location of the client.