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Restructuring Charges - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]    
Accrual for severance and related charges $ 4.0 $ 7.2
Long term amount 1.7 2.7
Accrued retention bonuses 2.2  
Amount recorded ratably over the period retained 2.3  
Minimum [Member]
    
Restructuring Cost and Reserve [Line Items]    
Gross remaining lease obligations 30.0  
Maximum [Member]
    
Restructuring Cost and Reserve [Line Items]    
Gross remaining lease obligations $ 35.0