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Goodwill, Intangible Assets and Impairment Charges - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 03, 2015 USD ($) | Dec. 31, 2014 USD ($) Tradeshow | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Goodwill And Intangible Assets [Line Items] |  |  |  |
Impairment of goodwill and intangible assets |  | $ 41,442,000 | $ 41,442,000 |
Impairment Charge, Intangible assets |  |  | 21,867,000 |
Impairment Charge, Goodwill |  |  | $ 19,575,000 |
Minimum |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Reporting units in excess of carrying value | 20.00% |  |  |
Vision Technologies |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Impairment of goodwill and intangible assets | $ 0 |  |  | $ 0
Number of main tradeshows for the NDS Business | Tradeshow |  | 2 |  |
Impairment Charge, Intangible assets |  | $ 21,800,000 |  |
Impairment Charge, Goodwill |  | $ 19,600,000 |  |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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