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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Income And Expenses [Abstract]        
Professional fees and other expenses $ 8.0 $ 8.1 $ 12.3 $ 17.6
Advisory retainer fees 1.3 1.5 2.6 3.0
Minimum guaranteed retainer fees 2.0   2.0  
Liability Award expense recognized 0.3 0.3 0.2 1.3
Liability Award expense unrecognized $ 2.0   $ 2.0