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Noncontrolling Interest Transactions - Additional Information (Detail) - USD ($)			3 Months Ended	12 Months Ended
	Mar. 30, 2016	Dec. 28, 2015	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Contingent consideration				$ 678,000		$ 253,000
Noncontrolling interest					$ 0
Reduction in cash, short-term interest receivable, and long-term investments					1,742,000
Deconsolidation effect in statement of operations					$ 28,000
Noncontrolling interest				$ 305,000		$ 208,000
Royalty payment description				Through June 30, 2021
Aegis Power Systems Inc [Member]
Noncontrolling Interest [Line Items]
Minority interest percentage by non controlling interest		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]
Deconsolidation effect in statement of operations		$ 28,000
Mission Power Solutions Inc [Member]
Noncontrolling Interest [Line Items]
Minority interest percentage by non controlling interest		18.00%
Contingent consideration				$ 200,000	144,000
Increased in liability reassessment obligation				202,000
Noncontrolling interest		$ 216,000
Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Reduction in cash, short-term interest receivable, and long-term investments					$ 5,000
Converpower Corporation [Member]
Noncontrolling Interest [Line Items]
Ownership percentage by parent in certain operating assets and cash	100.00%		100.00%
Minority interest percentage by non controlling interest	49.00%
Percentage of common shares exchanged	49.00%
Contingent consideration			$ 208,000	$ 478,000
Royalty payment description				Through June 30, 2021
Noncontrolling interest			$ 0
Percentage of control of business operations acquired			100.00%
Reduction in cash, short-term interest receivable, and long-term investments			$ 718,000
Deconsolidation effect in statement of operations			0
Increased in liability reassessment obligation				$ 448,000
Converpower Corporation [Member] | Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interest			$ (208,000)

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