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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Other Income And Expenses [Abstract]    
Professional fees and other expenses $ 6.3 $ 23.8
Advisory retainer fees 1.5 4.5
Minimum guaranteed retainer fees   5.5
Liability Award expense recognized 1.0 2.3
Liability Award expense unrecognized   $ 3.6