Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities.

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Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.

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Amount classified as other assets attributable to disposal group held for sale or disposed of.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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The amount of cash paid for royalties during the current period.

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Description of royalty payment.

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Ownership percentage by parent in certain operating assets and cash.

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Royalty agreement expiration date.

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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, 2016	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Contingent consideration				$ 253,000	$ 144,000
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				$ 208,000	$ 1,054,000
Royalty payment description				Through June 30, 2021
Royalty payments made				$ 58,000
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%
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	$ 167,000
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
Converpower Corporation [Member] \| Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interest			$ (208,000)