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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - Credit Facility - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Term A due on April 17, 2018    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Secured credit facilities $ 28.9 $ 29.5
Term A due January 17, 2020    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Secured credit facilities 212.7 216.0
Senior secured Term B loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Secured credit facilities $ 385.0 $ 386.0