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2423407 - Disclosure - Pension and Other Postretirement Benefits - Assumptions Used in Determining Benefit Obligations and Net Periodic Benefit Cost Amounts (Detail)
(http://www.belden.com/role/PensionAndOtherPostretirementBenefitsAssumptionsUsedInDeterminingBenefitObligationsAndNetPeriodicBenefitCostAmountsDetail)
TablePension And Other Employee Benefit Plans [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000913142 (http://www.sec.gov/CIK)
Pension And Other Employee Benefit Plans [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Benefits [Member]Other Benefits [Member]Pension Benefits [Member]Other Benefits [Member]
Weighted average assumptions for benefit obligations at year end:
 
 
 
 
Discount rate (as a percent)
3.00%  
3.70%  
3.60%  
4.00%  
Salary increase (as a percent)
3.30%  
 
3.50%  
 
Weighted average assumptions for net periodic cost for the year:
 
 
 
 
Discount rate (as a percent)
3.60%  
4.00%  
3.20%  
3.70%  
Salary increase (as a percent)
3.50%  
 
3.50%  
 
Expected return on assets (as a percent)
6.20%  
 
6.70%  
 
Assumed health care cost trend rates:
 
 
 
 
Health care cost trend rate assumed for next year (as a percent)
 
6.20%  
 
5.50%  
Rate that the cost trend rate gradually declines to (as a percent)
 
5.00%  
 
5.00%