Rendering

Component: (Network and Table)
Network
1109 - Disclosure - Commitments and Contingent Liabilities - Changes in Accrued Liability for Environmental Matters (Detail)
(http://www.koppers.com/taxonomy/role/DisclosureCommitmentsAndContingentLiabilitiesChangesInAccruedLiabilityForEnvironmentalMatters)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001315257 (http://www.sec.gov/CIK)
Commitments And Contingencies Disclosure [Abstract]Period [Axis]
2013-01-01 - 2013-12-31
2012-01-01 - 2012-12-31
Commitments And Contingencies Disclosure [Abstract]
 
 
Balance at beginning of year
14,100,000  
17,700,000  
Expense
1,800,000  
1,000,000  
Reversal of reserves
(1,200,000) 
(400,000) 
Cash expenditures
(900,000) 
(4,600,000) 
Currency translation
(1,900,000) 
400,000  
Balance at end of year
11,900,000  
 
14,100,000