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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Derivative [Line Items]      
Interest rate at period end (in percentage)     4.01%
2017 Swap | Term Loans      
Derivative [Line Items]      
Notional amount of derivative   $ 200.0  
Fixed interest rate (in percentage) 1.85%    
Derivative, fixed interest rate, term ( in years) 3 years    
Maturity date Nov. 01, 2020    
Basis spread on variable rate (in percentage)   1.20%  
Interest rate at period end (in percentage)   3.05%