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Acquisitions - Pro Forma Effect on Operating Results (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Tripwire [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenues | $ 2,354,191 | $ 2,405,198 |
Income (loss) from continuing operations | $ 92,104 | $ 23,302 |
Diluted income per share from continuing operations attributable to Belden stockholders | $ 2.14 | $ 0.53 |
Grass Valley and Prosoft [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenues |  | $ 2,401,200 | $ 2,420,099
Income (loss) from continuing operations |  | $ 67,956 | $ 66,874
Diluted income per share from continuing operations attributable to Belden stockholders |  | $ 1.54 | $ 1.49

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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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