Summary of the Results of Operations for Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2011		Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011		Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011		Jan. 01, 2011		Jan. 02, 2010
Segment Reporting Information [Line Items]
Net sales	$ 243,760		$ 218,720	$ 210,855	$ 182,572	$ 207,233		$ 177,793	$ 173,412	$ 160,683	$ 855,907	[1]	$ 719,121	[1]	$ 646,629	[1]
Operating income	44,912		37,186	35,248	31,364	34,613		32,011	29,729	26,435	148,710	[1]	122,788	[1]	111,441	[1]
Depreciation and amortization expense											19,708	[1]	17,014	[1]	15,888	[1]
Net capital expenditures											7,840	[1]	3,159	[1]	5,730	[1]
Total assets	1,146,512	[1]				873,172	[1]				1,146,512	[1]	873,172	[1]	816,346	[1]
Long-lived assets	779,129	[1]				609,513	[1]				779,129	[1]	609,513	[1]	599,320	[1]
Commercial Foodservice
Segment Reporting Information [Line Items]
Net sales											723,274	[1]	611,596	[1]	580,704	[1]
Operating income											181,963	[1]	148,443	[1]	130,557	[1]
Depreciation and amortization expense											15,839	[1]	13,331	[1]	14,135	[1]
Net capital expenditures											6,896	[1]	2,810	[1]	5,249	[1]
Total assets	752,876	[1]				712,738	[1]				752,876	[1]	712,738	[1]	694,026	[1]
Long-lived assets	519,517	[1]				521,915	[1]				519,517	[1]	521,915	[1]	527,250	[1]
Food Processing
Segment Reporting Information [Line Items]
Net sales											132,633	[1]	107,525	[1]	65,925	[1]
Operating income											19,997	[1]	20,580	[1]	12,193	[1]
Depreciation and amortization expense											3,053	[1]	3,130	[1]	1,350	[1]
Net capital expenditures											447	[1]	136	[1]	20	[1]
Total assets	238,724	[1]				103,829	[1]				238,724	[1]	103,829	[1]	69,137	[1]
Long-lived assets	146,281	[1]				57,950	[1]				146,281	[1]	57,950	[1]	43,518	[1]
Corporate and Other
Segment Reporting Information [Line Items]
Operating income											(53,250)	[1],[2]	(46,235)	[1],[2]	(31,309)	[1],[2]
Depreciation and amortization expense											816	[1],[2]	553	[1],[2]	403	[1],[2]
Net capital expenditures											497	[1],[2]	213	[1],[2]	461	[1],[2]
Total assets	154,912	[1],[2]				56,605	[1],[2]				154,912	[1],[2]	56,605	[1],[2]	53,183	[1],[2]
Long-lived assets	$ 113,331	[1],[2]				$ 29,648	[1],[2]				$ 113,331	[1],[2]	$ 29,648	[1],[2]	$ 28,552	[1],[2]

[1] Non-operating expenses are not allocated to the reportable segments. Non-operating expenses consist of interest expense and deferred financing amortization, foreign exchange gains and losses and other income and expense items outside of income from operations.

[2] Includes corporate and other general company assets and operations.