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Special Charges - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Special Charges [Line Items]      
Special charges   $ 427,000 $ 38,400,000
Non cash special charges     14,100,000
Cash outflow associated with special charges, amount paid 48,500,000    
Cash outflow associated with special charges, amount paid 24,100,000    
Cash outflow associated with special charges, amount expected to be paid in 2014 7,800,000    
Cash outflow associated with special charges, amount expected to be paid in 2015 5,000,000    
Cash outflow associated with special charges, amount expected to be paid in 2016 3,100,000    
Cash outflow associated with special charges, amount expected to be paid in 2017 3,100,000    
Cash outflow associated with special charges, amount expected to be paid from 2018 to 2025 $ 5,400,000