Equity-Based Compensation - Additional information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013 EquityPlan	Sep. 29, 2012	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock through payroll deductions			85.00%
Offering periods			2 years
Purchase intervals of a series			6 months
Maximum employee salary withholdings for purchase of common stock under the terms of the ESPP			15.00%
Number of shares issued under employee stock purchase plan			457,000
Number of outstanding stock options	2,621,406		2,621,406		3,128,408
Compensation expense	$ 754,000	$ 943,000	$ 1,836,000	$ 2,941,000
RSU conversion ratio			1
Stock Option Exchange Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of option holders exchanged options	87		87
Number of stock options exchanged			766,000
Compensation expense			$ 126,000
Stock Option Exchange Program | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercise price per share			$ 8.49
Minimum percentage of closing stock price for exchange to occur			50.00%
Award, vesting period			1 year
Stock Option Exchange Program | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period			3 years
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding stock options	336,000		336,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period			4 years