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172 - Disclosure - Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Detail)
(http://www.bbgi.com/taxonomy/role/DisclosureEmployeeBenefitPlansSummaryOfComponentsOfNetPeriodicBenefitCostAndOtherAmountsRecognizedInOtherComprehensiveIncome)
TableDefined Contribution Plan [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001099160 (http://www.sec.gov/CIK)
Defined Contribution Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Plan [Member]Supplemental Employee Retirement Plan [Member]Postretirement Benefits [Member]
Net periodic benefit cost
 
 
 
Service cost
  
8,169  
Interest cost
530,839  
51,696  
11,097  
Expected return on plan assets
(1,000,732) 
  
Net periodic benefit cost
(469,893) 
 
51,696  
 
19,266