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Employee Benefit Plans - Additional Information (Detail) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Oct. 02, 2015
Sep. 26, 2014
Oct. 02, 2015
Sep. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of options exercised $ 28,000 $ 300,000 $ 1,700,000 $ 700,000
Increase in authorized shares for ESPP     0  
Discretionary contributions of plan     25.00%  
Percent of employees' gross pay eligible for matching     4.00%  
Maximum contribution amount per participant     $ 1,000  
Contributions in period     $ 342,000 $ 354,000
Defined contribution plan description     The Company has a retirement/savings plan which qualifies as a thrift plan under Section 401(k) of the Internal Revenue Code. This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. The Company has made discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year.  
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of fair market value of Common Stock to purchase shares 85.00%   85.00%  
Minimum [Member] | Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Stock Purchase Plan Payroll Deductions     1.00%  
Maximum [Member] | Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Stock Purchase Plan Payroll Deductions     10.00%