Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Additional Information (Detail)

v2.4.0.8
Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Estimated Future Amortization Expense [Line Items]      
Amortization expense for intangibles $ 4.9 $ 2.3 $ 0.5
Identifiable asset with an indefinite life 0.5    
Impairment charge of indefinite-lived intangible 0 0  
Trade Names [Member]
     
Schedule Of Estimated Future Amortization Expense [Line Items]      
Impairment charge of indefinite-lived intangible     $ 0.1