Annual report pursuant to Section 13 and 15(d)

Professional Fees and Other Expenses - Additional Information (Detail)

v3.6.0.2
Professional Fees and Other Expenses - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Selling, General and Administrative Expenses [Member]      
Professional Fees And Other Expenses [Line Items]      
Professional fees and other expenses $ 12.1 $ 18.7 $ 25.1