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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax [Line Items]      
Accumulated undistributed earnings of certain foreign subsidiaries $ 87.8 $ 86.1  
Previously undistributed earnings of foreign subsidiaries to be repatriated in the future     15
Deferred tax liabilities related to previously undistributed earnings of foreign subsidiaries to be repatriated in the future     0.2
Deferred tax asset, federal net operating loss carryforwards 20.9 18.0  
Deferred tax asset, state net operating loss carryforwards 2.2 1.6  
Deferred tax asset, foreign net operating loss carryforwards 8.2 0.5  
Deferred tax asset, capital loss carryforwards 12.8 22.2  
Deferred tax asset, U.S. research tax credit carryforwards 6.3 6.3  
Deferred tax asset, U.S. foreign tax credits carryforwards 21.1 20.3  
Deferred tax asset, U.S. alternative minimum tax credits carryforwards 3.3 4.0  
Deferred tax asset, valuation allowance 131.8 123.9 76.0
Total deferred tax assets 16.9 19.2  
Income taxes paid 2.9 4.2 6.8
Unrecognized tax benefits 4.0 4.3 3.8
Unrecognized tax benefits that, if recognized, would impact our annual effective tax rate 3.9    
Unrecognized tax benefits that, interests 0.2    
Unrecognized tax benefits that, penalties 0.1    
Unrecognized tax benefits decrease due to potential expiration of statute of limitations and settlements with tax authorities 1.6    
Domestic Valuation allowance 0.5    
Research Tax Credit Carryforward
      
Income Tax [Line Items]      
Deferred tax asset, tax credit carryforwards expiration year 2022 2022  
Capital Loss Carryforward
      
Income Tax [Line Items]      
Deferred tax asset, valuation allowance 12.8 22.2  
Capital Loss Carryforward | Minimum
      
Income Tax [Line Items]      
Deferred tax asset, tax credit carryforwards expiration year 2013 2012  
Capital Loss Carryforward | Maximum
      
Income Tax [Line Items]      
Deferred tax asset, tax credit carryforwards expiration year   2013  
Deferred Tax Asset Operating Loss Carryforwards State and Local
      
Income Tax [Line Items]      
Deferred tax asset, valuation allowance 2.2 1.6  
Deferred Tax Asset Operating Loss Carryforwards Foreign
      
Income Tax [Line Items]      
Deferred tax asset, valuation allowance 8.3 0.5  
Deferred Tax Asset Operating Loss Carryforwards Domestic
      
Income Tax [Line Items]      
Deferred tax asset, valuation allowance 108.5 99.6  
Internal Revenue Service (IRS)
      
Income Tax [Line Items]      
Deferred tax asset, net operating loss carryforwards expiration year 2018 2018  
State and Local Jurisdiction
      
Income Tax [Line Items]      
Deferred tax asset, net operating loss carryforwards expiration year 2019 2019  
Foreign Tax Authority
      
Income Tax [Line Items]      
Deferred tax asset, net operating loss carryforwards expiration year 2030    
Deferred tax asset, net operating loss carryforwards that has an indefinite life 0.5 0.5  
Deferred tax asset, net operating loss carryforwards subject to expiration $ 7.7    
Deferred tax asset, tax credit carryforwards expiration year 2015 2015