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Restructuring Charges - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Restructuring And Related Activities [Abstract]      
Restructuring charges $ 0 $ 0  
Percentage of eliminated work force     6.00%
Pre-Tax Restructuring Charges     $ 0.5