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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 |  |

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