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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ (58,987) | $ (46,031)
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | 13,584 | (16,386)
Amounts reclassified from accumulated other comprehensive income (loss) | 6,336 | 3,430
Other comprehensive income (loss), net of tax | 19,920 | (12,956)
Ending balance | (39,067) | (58,987)
Foreign Currency Translation Component [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (23,411) | (2,591)
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | 18,750 | (20,820)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Other comprehensive income (loss), net of tax | 18,750 | (20,820)
Ending balance | (4,661) | (23,411)
Pension and Other Postretirement Benefit Plans [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (35,576) | (43,440)
Other comprehensive gain (loss) loss attributable to Belden before reclassifications | (5,166) | 4,434
Amounts reclassified from accumulated other comprehensive income (loss) | 6,336 | 3,430
Other comprehensive income (loss), net of tax | 1,170 | 7,864
Ending balance | $ (34,406) | $ (35,576)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 + Details
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