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
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other Income And Expenses [Abstract]        
Professional fees and other expenses $ 7.1 $ 8.0 $ 11.4 $ 12.3