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Goodwill and Definite Lived Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Trade Names
Intangible Assets [Line Items]        
Amortization of intangible assets $ 1.0 $ 1.3 $ 1.3  
Finite-lived intangible assets, amortization expense, next twelve months 0.2      
Finite-lived intangible assets, amortization expense, year two 0.2      
Finite-lived intangible assets, amortization expense, year three 0.2      
Finite-lived intangible assets, amortization expense, year four 0.1      
Finite-lived intangible assets, amortization expense, thereafter 0      
Carrying value 0.7 1.8   7.9
Impairment charges of intangible assets       $ 0.6