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Noncontrolling Interest Transactions - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 28, 2015	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Noncontrolling interest		$ 1,054,000	$ 2,780,000
Gain on sale of equity		28,000
Contingent consideration	$ 144,000	$ 144,000
Royalty payment description		Through June 30,2021
Reduction of noncontrolling interest		$ 0
Aegis Power Systems Inc [Member]
Noncontrolling Interest [Line Items]
Minority interest percentage by parent	49.00%	49.00%
Minority interest percentage by parent	51.00%
Noncontrolling interest	$ 1,698,000
Deconsolidated cash		$ 2,090,000
Deconsolidated other net assets		$ 1,317,000
Aegis Power Systems Inc [Member] \| Other Operating Income (Expense) [Member]
Noncontrolling Interest [Line Items]
Gain on sale of equity	$ 28,000
Mission Power Solutions Inc [Member]
Noncontrolling Interest [Line Items]
Minority interest percentage by parent	18.00%
Noncontrolling interest	$ 216,000