Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Deferred tax assets:
Inventory, receivable and warranty reserves	$ 11,434	$ 12,604
Net operating loss carryforwards	2,299	1,069
Tax credit carryforwards	7,764	7,213
Accrued employee benefits	2,167	2,233
Deferred profit	502	688
Stock-based compensation	3,409	2,715
Acquisition basis differences	2,226	2,369
Depreciation and fixed asset related	318
Other	243	207
Gross deferred tax assets	30,362	29,098
Less valuation allowance	(24,948)	(22,352)
Total deferred tax assets	5,414	6,746
Deferred tax liabilities:
Depreciation and fixed asset related		211
Gain on facilities sale	2,792	2,788
Acquisition basis differences	9,340	9,591
Other	283	252
Total deferred tax liabilities	12,415	12,842
Net deferred tax liabilities	$ (7,001)	$ (6,096)