Quarterly report pursuant to Section 13 or 15(d)

Professional Fees and Other Expenses - Additional Information (Detail)

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Professional Fees and Other Expenses - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other Income And Expenses [Abstract]    
Professional fees and other expenses $ 4.3 $ 9.5
Advisory retainer fees 1.3 1.5
Minimum guaranteed retainer fees 3.0  
Liability Award benefit and expense recognized (0.5) 1.0
Liability Award expense unrecognized $ 2.0